Will this help with my child's high school Geometry homework?

Yes. StudyPug covers Illinois high school Geometry strand by strand, including proofs, transformations, trigonometry, and coordinate geometry, so students can find help for exactly what their class assigned that night.

How long are the video lessons for Geometry?

Most video lessons run between 5 and 15 minutes. Students can pause, rewind, and re-watch as often as they need, then try practice problems right after to check their understanding before moving on.

Is there an Illinois state test for high school Geometry?

Illinois administers the IAR in grades 3 through 8 for math. High school students take the SAT-based state assessment in grade 11, not a separate Geometry end-of-course exam, so Geometry is not directly assessed as a standalone test.

Can my child use StudyPug on a tablet or phone?

Yes. StudyPug works on tablets, phones, laptops, and desktop computers, so your student can review Geometry lessons and work through practice problems on whatever device is most convenient at home or on the go.

Can I try StudyPug before paying?

Yes. StudyPug offers free sample lessons so you can see the content before subscribing. There is also a 30-day money-back guarantee if the service is not the right fit for your student.

IL High School Geometry Curriculum

Give your student the support they need to succeed in Illinois high school Geometry. Our lessons and practice problems follow what local schools teach, from transformations and proofs to trigonometry and coordinate geometry.

IL High School Geometry Curriculum

IDStandardStudyPug Topic

CC.HSG.CO.A.1Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.
- Parallel and perpendicular line segments
- Line symmetry
- Angles in a circle
- Chord properties
- Circles and circumference
- Arcs of a circle
- Areas and sectors of circles
CC.HSG.CO.A.2Represent transformations in the plane using, e.g., transparencies and geometry software; describe transformations as functions that take points in the plane as inputs and give other points as outputs. Compare transformations that preserve distance and angle to those that do not.
- Introduction to transformations
- Rotational symmetry and transformations
CC.HSG.CO.A.3Given a rectangle, parallelogram, trapezoid, or regular polygon, describe the rotations and reflections that carry it onto itself.
- Horizontal and vertical distances
- Rectangles
- Parallelograms
- Trapezoids, rhombi, and kites
- Polygons
- Complex polygons
CC.HSG.CO.B.6Use geometric descriptions of rigid motions to transform figures and to predict the effect of a given rigid motion on a given figure; given two figures, use the definition of congruence in terms of rigid motions to decide if they are congruent.
- Congruence and congruent triangles
CC.HSG.CO.B.7Use the definition of congruence in terms of rigid motions to show that two triangles are congruent if and only if corresponding pairs of sides and corresponding pairs of angles are congruent.
- Triangles congruent by SSS proofs
CC.HSG.CO.B.8Explain how the criteria for triangle congruence (ASA, SAS, and SSS) follow from the definition of congruence in terms of rigid motions.
- Triangles congruent by SAS and HL proofs
- Triangles congruent by ASA and AAS proofs
CC.HSG.CO.C.9Prove theorems about lines and angles.
- Parallel lines and transversals
- Pairs of lines and angles
- Parallel line proofs
- Perpendicular line proofs
CC.HSG.CO.C.10Prove theorems about triangles.
- Isosceles and equilateral triangles
- Classifying triangles
- Triangles
CC.HSG.CO.C.11Prove theorems about parallelograms.
- Area and perimeter of parallelograms
CC.HSG.CO.D.12Make formal geometric constructions with a variety of tools and methods.
- Perpendicular bisectors
CC.HSG.CO.D.13Construct an equilateral triangle, a square, and a regular hexagon inscribed in a circle.
- Inscribed angles and proofs
CC.HSG.SRT.A.1Verify experimentally the properties of dilations given by a center and a scale factor.
- Enlargements and reductions with scale factors
CC.HSG.SRT.A.2Given two figures, use the definition of similarity in terms of similarity transformations to decide if they are similar; explain using similarity transformations the meaning of similarity for triangles as the equality of all corresponding pairs of angles and the proportionality of all corresponding pairs of sides.
- Similar triangles
CC.HSG.SRT.B.4Prove theorems about triangles.
- Pythagorean theorem
- Estimating square roots
- Using the pythagorean relationship
- Applications of pythagorean theorem
CC.HSG.SRT.B.5Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.
- Similar polygons
CC.HSG.SRT.C.6Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.
- Use sine ratio to calculate angles and sides (Sin = o / h)
- Use tangent ratio to calculate angles and sides (Tan = o / a)
CC.HSG.SRT.C.7Explain and use the relationship between the sine and cosine of complementary angles.
- Use cosine ratio to calculate angles and sides (Cos = a / h)
- Cofunction identities
CC.HSG.SRT.C.8Use trigonometric ratios and the Pythagorean Theorem to solve right triangles in applied problems.
- Combination of SohCahToa questions
- Word problems relating ladder in trigonometry
- Word problems relating guy wire in trigonometry
- Other word problems relating angles in trigonometry
CC.HSG.C.A.1Prove that all circles are similar.
- Central angles and proofs
CC.HSG.C.A.2Identify and describe relationships among inscribed angles, radii, and chords.
- Central and inscribed angles in circles
CC.HSG.C.A.3Construct the inscribed and circumscribed circles of a triangle, and prove properties of angles for a quadrilateral inscribed in a circle.
- Circle chord, tangent, and inscribed angles proofs
CC.HSG.C.A.4Construct a tangent line from a point outside a given circle to the circle.
- Tangent properties
CC.HSG.C.B.5Derive using similarity the fact that the length of the arc intercepted by an angle is proportional to the radius, and define the radian measure of the angle as the constant of proportionality; derive the formula for the area of a sector.
- Radian measure and arc length
- Converting between degrees and radians
- Trigonometric ratios of angles in radians
CC.HSG.GPE.A.1Derive the equation of a circle of given center and radius using the Pythagorean Theorem; complete the square to find the center and radius of a circle given by an equation.
- Conics - Circle
CC.HSG.GPE.A.2Derive the equation of a parabola given a focus and directrix.
- Conics - Parabola
CC.HSG.GPE.A.3Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant.
- Conics - Ellipse
- Conics - Hyperbola
CC.HSG.GPE.B.4Use coordinates to prove simple geometric theorems algebraically.
- Introduction to vectors
- Slope equation: $m = \frac{y_2-y_1}{x_2- x_1}$
- Slope intercept form: y = mx + b
- General form: Ax + By + C = 0
- Point-slope form: y - y_1 = m(x - x_1)
CC.HSG.GPE.B.5Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.
- Parallel line equation
- Perpendicular line equation
- Combination of both parallel and perpendicular line equations
CC.HSG.GPE.B.6Find the point on a directed line segment between two given points that partitions the segment in a given ratio.
- Midpoint formula: $M = ( \frac{x_1+x_2}2 ,\frac{y_1+y_2}2)$
CC.HSG.GPE.B.7Use coordinates to compute perimeters of polygons and areas of triangles and rectangles, e.g., using the distance formula.
- Distance formula: $d = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$
CC.HSG.GMD.A.1Give an informal argument for the formulas for the circumference of a circle, area of a circle, volume of a cylinder, pyramid, and cone.
- Surface area and volume of cylinders
- Surface area and volume of cones
- Surface area and volume of prisms
CC.HSG.GMD.A.3Use volume formulas for cylinders, pyramids, cones, and spheres to solve problems.
- Surface area and volume of pyramids
CC.HSG.GMD.B.4Identify the shapes of two-dimensional cross-sections of three-dimensional objects, and identify three-dimensional objects generated by rotations of two-dimensional objects.
- Surface area of 3-dimensional shapes
- Introduction to surface area of 3-dimensional shapes
- Nets of 3-dimensional shapes
CC.HSG.MG.A.1Use geometric shapes, their measures, and their properties to describe objects.
- Scale diagrams
CC.HSG.MG.A.2Apply concepts of density based on area and volume in modeling situations.
- Word problems of polynomials
CC.HSA.SSE.A.1Interpret expressions that represent a quantity in terms of its context.
- What is a polynomial?
- Applications of linear equations
CC.HSA.SSE.B.3Choose and produce an equivalent form of an expression to reveal and explain properties of the quantity represented by the expression.
- Common factors of polynomials
- Adding and subtracting rational expressions
- Evaluating polynomials
- Using algebra tiles to factor polynomials
- Solving polynomial equations
CC.HSA.CED.A.1Create equations and inequalities in one variable and use them to solve problems. Include equations arising from linear and quadratic functions, and simple rational and exponential functions.
- Introduction to linear equations
- Solving rational equations
- Solving exponential equations using exponent rules
CC.HSA.CED.A.2Create equations in two or more variables to represent relationships between quantities; graph equations on coordinate axes with labels and scales.
- Slope intercept form: y = mx + b
- Graphs of rational functions
- Applications of rational equations
- Simplifying complex fractions
- Partial fraction decomposition
CC.HSA.CED.A.3Represent constraints by equations or inequalities, and by systems of equations and/or inequalities, and interpret solutions as viable or non-viable options in a modeling context.
- Determining number of solutions to linear equations
- Linear programming word problems
- Graphing reciprocals of linear functions
- Graphing reciprocals of quadratic functions
CC.HSA.CED.A.4Rearrange formulas to highlight a quantity of interest, using the same reasoning as in solving equations.
- Point-slope form: y - y_1 = m(x - x_1)
- Graphing quadratic inequalities in two variables
- Graphing systems of quadratic inequalities
CC.HSA.REI.C.7Solve a simple system consisting of a linear equation and a quadratic equation in two variables algebraically and graphically.
- System of linear-quadratic equations
- Nature of roots of quadratic equations: The discriminant
- Applications of quadratic equations
- Solving quadratic inequalities
CC.HSF.IF.C.7Graph functions expressed symbolically and show key features of the graph, by hand in simple cases and using technology for more complicated cases.
- Graphing linear functions using a single point and slope
- Graphing quadratic functions: General form VS. Vertex form
- Graphing exponential functions
- Graphing logarithmic functions
- Graphing from slope-intercept form y=mx+b
- Graphing transformations of exponential functions
- Graphing transformations of logarithmic functions
- Sine graph: y = sin x
- Cosine graph: y = cos x
- Tangent graph: y = tan x
- Cotangent graph: y = cot x
- Secant graph: y = sec x
- Cosecant graph: y = csc x
CC.HSS.ID.B.6Represent data on two quantitative variables on a scatter plot, and describe how the variables are related.
- Reading and drawing line graphs
- Bivariate, scatter plots and correlation

Geometry

About High School Illinois Geometry

Illinois high school Geometry follows the Illinois Learning Standards, organized around geometric reasoning, proof, and application. Students work through congruence and similarity transformations, triangle proofs, right triangle trigonometry, circle relationships, coordinate geometry, and three-dimensional measurement. StudyPug provides video lessons and practice problems covering every strand so students can get unstuck and stay on track with what their class requires.

Strands covered: congruence, similarity and transformations, right triangle trigonometry, circles, coordinate geometry, and geometric measurement and modeling
Video lessons taught by certified teachers for every Geometry topic
Practice problems with step-by-step explanations aligned to Illinois Learning Standards
Accessible on any device, any time, so students can review at their own pace

Curriculum topics by strand

Browse Geometry lessons and practice problems organized by strand and aligned to the Illinois Learning Standards.

Topic includes:

Practice

Video

Quiz

Standard

StudyPug Topic

Illinois High School Geometry Topics

Congruence and rigid motions: precise definitions of geometric figures, transformations as functions, triangle congruence criteria (ASA, SAS, SSS), and formal proofs about lines, angles, triangles, and parallelograms.
Geometric constructions: formal constructions using a variety of tools, including equilateral triangles, squares, and regular hexagons inscribed in a circle.
Similarity and dilations: similarity transformations, the AA criterion, triangle similarity proofs, and applying congruence and similarity to solve problems in geometric figures.
Right triangle trigonometry: trigonometric ratios for acute angles, the relationship between sine and cosine of complementary angles, and applying the Pythagorean Theorem and trig ratios to applied problems.
Circles: inscribed angles, radii, chords, inscribed and circumscribed circles, tangent lines, arc length, radian measure, sector area, and proving all circles are similar.
Coordinate geometry: equations of circles and parabolas, ellipses and hyperbolas, slope criteria for parallel and perpendicular lines, partitioning line segments, and using coordinates to compute perimeters and areas.
Geometric measurement and modeling: volume formulas for cylinders, pyramids, cones, and spheres; cross-sections of three-dimensional objects; density applications; and using geometric methods to solve design problems.
Algebraic connections: interpreting and creating equations, systems of equations, and graphing functions as they appear in geometric contexts.

How StudyPug Helps Illinois High School Geometry Students

When a student gets stuck on a proof or a trigonometry problem, StudyPug lets them go straight to the lesson for that specific topic rather than waiting for the next class. Video lessons walk through each concept step by step, and practice problems with full explanations let students check whether they have understood before moving on.

Every lesson is organized by strand so students and parents can quickly find the Illinois Learning Standards topic that matches what is happening in class that week, whether it is congruence transformations, coordinate geometry, or three-dimensional volume.

Aligned to Illinois High School Geometry Curriculum

StudyPug Geometry content is built to match the Illinois Learning Standards for high school mathematics, covering every strand from congruence and similarity through circles, coordinate geometry, and geometric modeling, so students practice the same material their teacher is covering in class.

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Written by the StudyPug Math Team

Last updated June 5, 2026

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