Sum of Angles, Triangles and Exterior Theorem

Which of the following terms best describes Angle d?

• Remote interior angle

• Corresponding angle

• Exterior angle

• Interior angle

Find the indicated angle. (What is ?)

• 91°

• 81°

• 89°

• 109°

Find the indicated angle measure. (What is ?)

• 51°

• 37°

• 167°

• 41°

Solve for x

• 49

• 58

• 70

• 94

Solve for x

• 70

• 23

• 120

• 130

Solve for x

• 60

• 120

• 40

• 65

The sum of the angle measures of a triangle is 180° 
m∠A + m∠B + m∠C = 180°

• Triangle Sum Theorem

• Exterior Angle Theorem

• Third Angle Theorem

• Centroid Theorem

The measure of an exterior angle of a triangle is equal to the sum of the measures of its remote interior angles.
m∠4 = m∠1 + m∠2

• Triangle Sum Theorem

• Exterior Angle Theorem

• Third Angles Theorem

• Congruent Triangles Theorem

Solve for x

• 30°

• 40°

• 50°

• 60°

Find the measure of angle A.

• 75^o

• 60^o

• 30^o

• 38^o