Instructional Video5:02
Curated OER

Why Are the Angles of Equilateral Triangles Always Equal to 60¼?

6th - 10th
Learn how to identify an equilateral triangle by evaluating its congruent sides. Once you've determined that that sides are congruent you'll be able to use the triangle sum theorem to determine the angles in an equilateral triangle. This...
Instructional Video5:09
Curated OER

How Do You Find Missing Angles in a Triangle With Variables?

8th - 10th
Are you working on finding the missing angles of triangles in your class? Consider this video. An instructor uses the triangle sum theorem to create an equation that helps her find the missing angles. She explains each step and writes...
Instructional Video5:44
Curated OER

How Do You Find Missing Angles in a Triangle With Variables?

6th - 12th
Are you working on finding the missing angles in triangles in your class? Consider this video. An instructor uses the triangle sum theorem to create an equation that helps her find the missing angles. She explains each step and writes...