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Line Symmetry: Discover Reflection in Shapes and Objects

CC.HSF.TF.A.1

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Converting between degrees and radians

Trigonometric ratios of angles in radians

Radian measure and arc length

CC.HSF.TF.A.2

Unit circle

CC.HSF.TF.A.3

Solving expressions using 45-45-90 special right triangles

Solving expressions using 30-60-90 special right triangles

Find the exact value of trigonometric ratios

CC.HSF.TF.B.5

Graphing transformations of trigonometric functions

Determining trigonometric functions given their graphs

CC.HSF.TF.B.6

Find the difference of squares: (a - b)(a + b) = (a^2 - b^2)

Find the difference of squares

Solving two-step linear equations using addition and subtraction: ax + b = c

Two-step Linear Equations

Two-step Linear Equations LHS

Solve Linear Equations Using Addition and Subtraction – Word Problem

Two-step Linear Equations — Word Problem

CC.HSF.TF.B.7

Evaluating inverse trigonometric functions

CC.HSF.TF.C.8

Pythagorean identities

CC.HSF.TF.C.9

Sum and difference identities

Sum and Difference Identities

Double-angle identities

Cofunction identities

CC.HSG.C.B.5

CC.HSG.CO.A.1

Line symmetry

Angles in a circle

Chord properties

Circles and circumference

Circle properties

Parallel and perpendicular line segments

Identifying Parallel Lines

Identifying Perpendicular Lines

CC.HSG.SRT.C.6

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.7

Use cosine ratio to calculate angles and sides (Cos = a / h)

CC.HSG.SRT.C.8

Combination of SohCahToa questions

Word problems relating ladder in trigonometry

Word problems relating guy wire in trigonometry

CC.HSG.SRT.D.10

Law of sines

Ambiguous case: SSA triangles

Law of cosines

CC.HSG.SRT.D.11

Applications of the sine law and cosine law

CC.HSG.SRT.D.9

Area of triangles: 1/2 a*b sin(C)

CC Standards Trigonometry

math

Intro

Ex. 1:

<p>- Hi, welcome to this question right here. So, this question here's trying to find and draw all the lines of symmetry on the figure. Remember you had a vertical line, horizontal line and something that's called oblique lines, right? So you if you look at this figure right here if you're trying to draw the lines symmetry you just have to think, this line kind of represents the mere. So if you cut it down, it's going to form something that's called the symmetrical images. So, I guess you probably have two for this one, check it out. So if you join a line down this way right here, a vertical line down this way, you will see that these two sides are now symmetrical. This is called the vertical line of symmetry. Now, there is another one. The other one right here will be if you just cut it across like right in the middle right here, the top and the bottom will also form the symmetrical images and this line right here is called a horizontal line, horizontal line of symmetry, okay? So, I think there's only two right here. I bet I guess you can't really cut into half the other way around. So there's only two. Thanks for watching.</p>

Objects which have line symmetry or reflection symmetry can form symmetrical images where they are cut by an imaginary line that is called line of symmetry. An object can have more than one lines of symmetry. 

Defining and identifying line symmetry

Understanding tessellations

Tessellations using translations and reflections

Tessellations using rotations