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- Fourth Class Maths
- Angles and Lines

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Get Started Now- Intro Lesson: a3:13
- Intro Lesson: b2:29
- Intro Lesson: c3:12
- Intro Lesson: d3:02
- Intro Lesson: e2:23
- Lesson: 1a1:39
- Lesson: 1b1:22
- Lesson: 1c1:23
- Lesson: 1d2:01
- Lesson: 1e2:02
- Lesson: 2a1:14
- Lesson: 2b1:22
- Lesson: 2c1:28
- Lesson: 3a1:08
- Lesson: 3b0:59
- Lesson: 3c1:11
- Lesson: 4a2:09
- Lesson: 4b3:06
- Lesson: 4c5:47
- Lesson: 5a1:57
- Lesson: 5b2:04
- Lesson: 5c2:37
- Lesson: 5d2:42

In this lesson, we will learn:

**Points, Lines, Line Segments**and**Rays**are**basic figures**in math that can be used to construct more complicated figures (i.e. angles, shapes, parallel/perpendicular lines, etc.)

- A
is a dot with position but no size nor shape (undefined) $\,$__point__ - There are an infinite number of points in figures (i.e. you can draw many points between endpoints in a line segment) $\,$
- The proper
**notation**of a point is just to write the named letter (ex. point $A$)

- A
has no beginning/end; an ongoing straight path of points__line__ - The
*arrows*on both sides mean that it can extend infinitely in that direction - The proper
**notation**of a line is to write the letters of two points in the figure and draw a double-sided arrow above the letters (ex. line $\overleftrightarrow{AB}$) - A
is a part of a line with two finite endpoints__line segment__ - A
**line**has*arrows*on both ends whereas the**line segment**has endpoints on both ends; the line continues forever, where the line segment ends where it is drawn - The proper
**notation**of a line segment is to write the letters of the two endpoints and draw a bar above the letters (ex. line segment $\overline{AB}$) - A
starts at one endpoint and extends in one direction__ray__ - One end of the ray has a point, whereas the other end of the ray has an
*arrow* - The proper
**notation**of a ray is to write the letters of two points in the figure (starting with the letter of the endpoint) and draw a one-sided arrow above the letters (ex. ray $\overrightarrow{AB}$ )

- IntroductionIntroduction to Points, Lines, Line Segments and Rays:a)Introduction to basic figures and pointsb)What are lines?c)What are line segments?d)What are rays?e)Review of points, lines, line segments and rays
- 1.
**Identifying lines, line segments, and rays**

Name the figure that is made by points $A$ and $B$ as either: a line, a line segment, or a ray.a)b)c)d)e) - 2.
**Proper notation for lines, line segments and rays**

Use proper notation (with letters and symbols) to name the figurea)b)c) - 3.
**Drawing lines, line segments and rays**

Draw the figure:a)ray $\overrightarrow{MN}$b)line segment $\overline{QR}$c)line $\overleftrightarrow{GH}$ - 4.
**Combinations of lines, line segments and rays**

Name all the lines, line segments, and/or rays in the picture. Use proper notation.a)b)c) - 5.
**Intersecting lines, line segments and rays**

Connect the dots to draw the figures as indicated. Will the figure intersect? Yes or No.a)$\overrightarrow{XW}$ and $\overleftrightarrow{YZ}$b)$\overline{AB}$ and $\overrightarrow{DC}$c)$\overline{NO}$ and $\overrightarrow{PQ}$d)$\overline{RS}$ and $\overleftrightarrow{TU}$