Exterior Angle Theorem

What is the rule for finding the measurement of an exterior angle in a triangle?

• Add the two angles that are adjacent to the exterior angle.

• Subtract the two interior angles from 180 degrees.

• Add the two interior angles that are not adjacent to the exterior angle.

• Multiply the two interior angles that are not adjacent to the exterior angle.

If the exterior angle of a triangle is 104 degrees and one of the non-adjacent interior angles is 79 degrees, what is the other non-adjacent interior angle?

• 25 degrees

• 104 degrees

• 180 degrees

• 79 degrees

In the equation 18X - 15 = 13X - 11 + 4X + 1, what is the value of X?

• 3

• 5

• 7

• 9

If the exterior angle of a triangle is represented as 9X - 8 and X is 17, what is the measurement of the exterior angle?

• 135 degrees

• 180 degrees

• 145 degrees

• 153 degrees

If the exterior angle of a triangle is 145 degrees, what is the measurement of the adjacent interior angle to form a straight line?

• 65 degrees

• 35 degrees

• 45 degrees

• 55 degrees