This video shows how to work step-by-step through one or more of the examples in Vertical Angles.
Grades 7 through HS Material from CK-12Preview Assign
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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.