Triangle Angle Sum and Exterior Angle Theorem

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 50 degrees and angle B is 60 degrees, what is angle C in triangle ABC?

Back

Angle C is 70 degrees (180 - 50 - 60 = 70).

Front

What is the relationship between the angles in a triangle?

Back

The angles in a triangle are related such that their sum is always 180 degrees.

Front

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

Back

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

Front

What is the formula for finding the exterior angle of a triangle?

Back

The exterior angle = Angle 1 + Angle 2 (where Angle 1 and Angle 2 are the two non-adjacent interior angles).

Front

In triangle ABC, if angle A = 30 degrees and angle B = 70 degrees, what is angle C?

Back

Angle C is 80 degrees (180 - 30 - 70 = 80).

Front

What type of triangle has all angles less than 90 degrees?

Back

It is an acute triangle.