Triangle Angle-sum and Exterior Angle Theorem Review

Front

What is the Triangle Angle-sum Theorem?

Back

The Triangle Angle-sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.

Front

If one angle of a triangle is 90 degrees, what type of triangle is it?

Back

It is a right triangle.

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

What is the Exterior Angle Theorem?

Back

The Exterior Angle Theorem states that the measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles.

Front

If angle A is 40 degrees and angle B is 70 degrees, what is angle C in triangle ABC?

Back

Angle C is 70 degrees (180 - 40 - 70 = 70).

Front

What is the relationship between the angles in a linear pair?

Back

The angles in a linear pair are supplementary, meaning they add up to 180 degrees.

Front

How do you find the measure of an unknown angle in a triangle?

Back

To find the measure of an unknown angle in a triangle, subtract the sum of the known angles from 180 degrees.

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

If angle D is an exterior angle, and angles E and F are the two non-adjacent interior angles, how do you express angle D?

Back

Angle D = Angle E + Angle F.

Front

What is the measure of the third angle in a triangle if the other two angles are 45 degrees and 55 degrees?

Back

The third angle measures 80 degrees (180 - 45 - 55 = 80).