Identify the type of angle without measurement.

A geometric proof. Prove two angles in this model are equal in measure.

Use an angle wheel to make estimates of the measures of various angles. Printable instructional activity.

[Free Registration/Login may be required to access all resource tools.] Classify different types of triangles by their angles.

Explores how to measure the length of a line segment through examples and a video lesson. [0:40]

For this task, students use a piece of string or another tool to measure the radius of the circle and then mark off the corresponding arc length on the unit circle as many times as they need to for 0, 1, 2, 3, 4, 5, and 6 radians. They...

This activity is designed for students to make conjectures about triangles. Students will create three lists to represent the measures of the angles of the triangle. The entire class list will then be sent to each student for analysis,...

Using Cabri Jr, the students (with the teachers help) will create parallel lines cut by a transversal, measure angles, and compare the relationships of the angles formed using features of the Cabri Jr.

Convert angle measures given in degrees to radians and vice versa. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

In this instructional activity, 4th graders will explore protractors, rulers, balance both radial, and symmetrical, and concepts of angle measurements as they create their own mandalas.

Here is a site that clearly and thoroughly explains the radian measure of angles. There are example problems solved, problems for the student to attempt, and answers to the student problems.

In this instructional activity, students explore different polygons by drawing them, measuring angles, and manipulating interactive sketches to find the angle sum for any polygon. Students also explore the angle measures in regular...

[Free Registration/Login may be required to access all resource tools.] Define Radian Measure and Critical Angles in Radians.

Practice measuring angles with the protractor with this interactive activity.

Practice problems with unknown angles.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to calculate the sum of the interior angles of a polygon and the measure of one interior angle of a regular polygon.