Search

Google Classroom

GeoGebra Lesson

Outline

Lines and Angles

Lines and Angles

Author:Duane Habecker

Topic:Angles, Straight Lines

A series of applets about lines and angles for 10 to 12 year old students.

Basic Geometric Objects and definitions
Types of angles
Animated acute angles
Animated view of right angles.
Animated view of obtuse angles.
Animated view of straight angles.
Animated view of reflex angles.
Protractor Practice (Not Random)
Protractor Practice (Random)
Sum of angles in polygons
Angles in a 5-pointed star
Sum of interior angles in a triangle
Sum of the angles in a triangle
Missing angle in a triangle
Definition of complementary angles
Missing complementary angle
Supplementary angles
Missing supplementary angle
Vertical angles
Triangle on a line with missing angles
Angles on a line
Broken Protractor

Basic Geometric Objects and definitions

New Resources

Angle Addition Postulate (V2) - Integer Solutions
Midpoint Theorem Questions: Mild
Basic and Compound Inequality Illustrator
Laundry Basket
Modifiable Right Triangular Prism

Discover Resources

Reflection of a shape
Albert's Unfinished Rectangle
Opposite Sides of a Parallelogram are Congruent (True Final)
mean mode median in frequency table
Walking the Number Line

Discover Topics

Calculus
Boxplot
Equilateral Triangles
Arithmetic Operations
Congruence

About Partners Help Center

Terms of Service Privacy License

Graphing Calculator Calculator Suite Math Resources

Download our apps here:

© 2026 GeoGebra®