Geometry Unit: Lines, Angles, and Triangles

Amber Thomas
Grade Levels
3rd - 5th, Homeschool
Formats Included
  • PDF
  • Activity
42 pages
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Amber Thomas
Easel Activity Included
This resource includes a ready-to-use interactive activity students can complete on any device. Easel by TpT is free to use! Learn more.


If you are looking for geometry lessons for third, fourth, or fifth grade, this unit will be useful for you. This geometry unit contains math worksheets and multi-modal activities for the following concepts:

✅ intersecting lines
✅ parallel lines
✅ perpendicular lines
✅ lines
✅ line segments
✅ rays
✅ acute angles
✅ obtuse angles
✅ right angles
✅ isosceles right triangles
✅ equilateral acute triangles
✅ scalene obtuse angles
✅ congruent figures

This unit includes a total of 5 visual and kinesthetic activities for students, and 4 worksheets. These lessons should take about a week to complete.

This geometry unit contains:

✅ Types of line relationships demonstration and activity
✅ Types of lines demonstration and activity
✅ Types of angles demonstration and activities
✅ Classifying triangles homework sheet (2 pages, with answer key)
✅ Triangles exploration (with answer key)
✅ Types of angles worksheet
✅ Lines worksheet
✅ Line pairs in figures worksheet (with answer key)
✅ Types of triangles worksheet (with answer key)
✅ Geometry open response question worksheet

Update: Teachers Pay Teachers has included a digital overlay. This means you can upload it directly to your Google Classroom from this site. Students can type answers in the boxes provided. They can use the pen tool to circle chosen answers.

The materials that you will need to complete the activities with your class are:
► Masking tape
► Clear tape
► Popsicle sticks
► Permanent markers (orange, red, blue)
► Colored construction paper

✨✨✨ Are you looking for more ways to help your students excel in and enjoy geometry? I have a whole range of geometry items here! Check out these popular products. ✨✨✨

Geometry Mini Unit: 3 Dimensional Figures
Snowflake Project for Geometry
Measuring Degrees of Angles Task Cards and Activities
Parallel and Perpendicular Line Pairs Robots
Drawing Perpendicular and Parallel Lines with Tools
Drawing Parallel and Perpendicular Lines with Tools Project

Total Pages
42 pages
Answer Key
Teaching Duration
1 Week
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to see state-specific standards (only available in the US).
Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.
Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.
Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in real world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.
Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure.
An angle that turns through 𝘯 one-degree angles is said to have an angle measure of 𝘯 degrees.


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