Triangles Sum Theorem & Exterior Angle Theorem

Front

What does the Triangle Sum Theorem state?

Back

The Triangle Sum Theorem states that the sum of all angles in a triangle is 180°.

Front

If one angle of a triangle is 79° and another is 43°, what is the measure of the third angle?

Back

The third angle is 58°.

Front

What is the measure of an exterior angle of a triangle?

Back

The measure of an exterior angle of a triangle is equal to the sum of the measures of the two opposite interior angles.

Front

If two angles of a triangle are 50° and 60°, what is the third angle?

Back

The third angle is 70°.

Front

What is the formula to find the third angle in a triangle?

Back

The formula is: Third Angle = 180° - (First Angle + Second Angle).

Front

What is the sum of the angles in any triangle?

Back

The sum of the angles in any triangle is always 180°.

Front

If an exterior angle measures 120°, what is the sum of the two opposite interior angles?

Back

The sum of the two opposite interior angles is 120°.

Front

What is the relationship between an exterior angle and the two opposite interior angles?

Back

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

Front

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

Back

It is a right triangle.

Front

What is the measure of an angle if the other two angles in the triangle are 45° each?

Back

The measure of the angle is 90°.