Triangle Sum Theorem and Exterior Angle Theorem

Front

What is the Triangle Sum Theorem?

Back

The Triangle 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 the third angle in a triangle if the first two angles are 79 degrees and 43 degrees?

Back

58 degrees.

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of the triangle and the extension of an adjacent side.

Front

According to the Exterior Angle Theorem, how is an exterior angle related to the interior angles?

Back

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

Front

What is the measure of angle A if angle B is 60 degrees and angle C is 90 degrees?

Back

Angle A is 30 degrees.

Front

What do you call angles that are less than 90 degrees?

Back

Acute angles.

Front

What do you call angles that are greater than 90 degrees but less than 180 degrees?

Back

Obtuse angles.

Front

If two angles of a triangle are 45 degrees each, what is the measure of the third angle?

Back

The third angle is 90 degrees.

Front

What is the relationship between the angles in a right triangle?

Back

In a right triangle, one angle is 90 degrees, and the sum of the other two angles is 90 degrees.