Triangles Sum Theorem & 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 45° and 55°?

Back

The third angle measures 80°.

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 opposite interior angles.

Front

Can a triangle have angles measuring 150°, 110°, and 100°?

Back

No, because the sum of the angles exceeds 180°.

Front

What is the measure of angle b if angle a is 36° and angle c is 64°?

Back

Angle b measures 80°.

Front

What is the sum of the angles in any triangle?

Back

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

Front

If two angles of a triangle are equal, what type of triangle is it?

Back

It is an isosceles triangle.

Front

What is the measure of the third angle in a triangle if the first angle is 79° and the second angle is 43°?

Back

The third angle measures 58°.

Front

If one angle of a triangle is 36° and the other two angles are equal, what are their measures?

Back

Each of the other two angles measures 72°.