Finding Unknown Exterior Angles in Triangles

What is the sum of the angles on a straight line?

• 90 degrees

• 180 degrees

• 45 degrees

• 360 degrees

What is the sum of the interior angles of a triangle?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

How is an exterior angle of a triangle formed?

• By extending one of the sides of the triangle outwards

• By bisecting one of the interior angles

• By drawing a perpendicular from one vertex

• By connecting the midpoints of two sides

What is the relationship between an exterior angle and the interior angles of a triangle?

• The exterior angle is equal to the difference between the two opposite interior angles

• The exterior angle is half the sum of the two opposite interior angles

• The exterior angle is equal to the sum of the two opposite interior angles

• The exterior angle is equal to the sum of all three interior angles

Which of the following is true about the exterior angle of a triangle?

• It is always equal to the sum of the two opposite interior angles

• It is always less than the sum of the interior angles

• It is always equal to one of the interior angles

• It is always greater than any of the interior angles

If angle A is 40 degrees and angle B is 60 degrees, what is the exterior angle D?

• 80 degrees

• 120 degrees

• 100 degrees

• 90 degrees

In the example problem, what is the value of angle D if angle A is 50 degrees and angle B is 30 degrees?

• 70 degrees

• 80 degrees

• 100 degrees

• 90 degrees

What is the exterior angle D if angle A is 90 degrees and angle B is 40 degrees?

• 150 degrees

• 140 degrees

• 130 degrees

• 120 degrees

If angle A is 70 degrees and angle B is 50 degrees, what is the exterior angle D?

• 110 degrees

• 120 degrees

• 130 degrees

• 140 degrees

What is the exterior angle D if angle A is 30 degrees and angle B is 60 degrees?

• 90 degrees

• 80 degrees

• 100 degrees

• 110 degrees