Sum of the angles of a triangle
Students prove that the sum of the interior angles of a triangle is 180 degrees. Students are introduced to Geometer's Sketchpad through a demonstration then try their hand at proving the interior angle's measurement.
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Angles in Triangles and Quadrilaterals
This short video show viewers how to connect the sum of the angles in a triangle to other angle measurements. Pupils determine the missing measures for angles involved with triangles and quadrilaterals. Class members then must explain...
7 mins 8th - 10th Math CCSS: Adaptable
New Review ASA and AAS Triangle Congruence Lesson
The location of the side makes a difference. One of the videos in a geometry playlist introduces angle-side-angle and angle-angle-side congruence relationships. Using drawings, the video shows how these two congruence statements are...
4 mins 8th - 11th Math CCSS: Adaptable
New Review The Third Angle Theorem: Lesson
If two sets of angles are equal, the third set is too. An informative portion of a playlist on geometry develops the Third Angle Theorem for triangles. Using the theorem, the presenter shows how to determine the measure of missing angles...
3 mins 8th - 11th Math CCSS: Adaptable
Write Equations for Problems Using Facts about Angle Relationships
You can relate geometry to many sports, but this video relates it to billiards. Show your learners that the angle of approach equals the angle of departure. Challenge them to use this fact and the property of supplementary angles to...
5 mins 6th - 8th Math CCSS: Designed
How Do You Find Missing Angles in a Triangle With Variables?
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...
5 mins 8th - 10th Math