Exploring Angles

5. If the sum of the interior angles of triangle ABC is 180°, and angle A = 30°, what is the measure of angle B if angle C is 90°?

• 75°

• 120°

• 60°

• 45°

In triangle STU, angle S = 40° and angle T = 100°. What is the measure of the exterior angle at vertex U?

• 160°

• 90°

• 120°

• 140°

In triangle ABC, angle A = 50°, angle B = 60°. What is the measure of angle C?

• 80°

• 70°

• 90°

• 40°

In triangle DEF, angle F = 70°. If the exterior angle at vertex D is 110°, what is the measure of angle E?

• 40°

• 60°

• 50°

• 30°

What is the measure of an angle that is supplementary to a 65-degree angle?

• 115 degrees

• 125 degrees

• 105 degrees

• 135 degrees

• b = 48

• a = 58

• d = 122

• c = 48

Find the measure of angle 4

• 27^o

• 153^o

• 63^o

• 90^o

What is the measure of an angle that is complementary to a 40-degree angle?

• 50 degrees

• 140 degrees

• 90 degrees

• 45 degrees

Calculate the exterior angle at vertex X of triangle XYZ if angle Y = 40° and angle Z = 60°.

• 90°

• 80°

• 120°

• 100°

Triangle PQR has angles P = 45° and Q = 55°. What is the measure of the exterior angle at vertex R?

• 75°

• 90°

• 100°

• 120°