Ex: Find the Coordinates on a Circle Given an Angle and the Radius

This video explains how to determine the coordinates of a point on a circle given an angle and the radius of the circle.

Ex: Sine and Cosine Values Using Reference Triangles – Degrees

This video explains how t use the 30-60-90 and 45-45-90 reference triangles to determine sine and cosine function values on the coordinate plane.

Introduction to the Interior and Exterior Angles of a Triangle.

This video will define the interior and exterior angles of a triangle and then state several theorems involving the interior and exterior angles of a triangle.

Proof: Adjacent Angles Formed by Perpendicular Lines are Congruent

Proof: If Two Lines Form Congruent Adjacent Angles, Then The Lines Are Perpendicular

Proof: If The Ext. Sides of Two Adj. Acute Angles are Perpendicular, The Angles Are Complementary

Complementary, Supplementary, and Vertical Angles