V L T The sum of the interior angles of a triangle is 180 degrees.

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V L T The sum of the interior angles of a triangle is 180 degrees. Triangle Sum Theorem: Find the missing angle measures. 1. 2. 3. Use the Triangle Sum Theorem to find the measures of each angle in degrees. 4. 5. An angle INSIDE a triangle formed by two sides of the triangle The sum of the interior angles of a triangle is 180 degrees. V L T

Exterior Angle: Remote Interior Angle: Exterior Angle Theorem: Use the Exterior Angle Theorem to find the measures of each angle in degrees. 6. y 30° x 40° 110° z An angle formed OUTSIDE a polygon by extending an adjacent side An interior angle that is NOT adjacent to the exterior angle. The measure of an exterior angle is equal to the sum of its remote interior angles. D E F L K J