Animation of Types of Angles

Learn about all types of angles under 2 minutes. Illustrates acute, right, obtuse, straight, reflex, and full angles.

Grades 7 through 8 Material from CK-12

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Use facts about supplementary, complementary, vertical, and adjacent angles in a multi?step problem to write and solve simple equations for an unknown angle in a figure




Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle?angle criterion for similarity of triangles.