4a.3 Triangle Angle Sum 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°.

Front

If one angle of a triangle is 50° and another is 60°, what is the measure of the third angle?

Back

70°

Front

What do you call an angle that measures exactly 90 degrees?

Back

Right angle.

Front

If a triangle has angles measuring 30° and 60°, what is the measure of the third angle?

Back

90°

Front

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

Back

60°.

Front

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

Back

90°.

Front

What is the sum of the angles in a triangle?

Back

180°.

Front

If one angle of a triangle is 80° and another is 50°, what is the measure of the third angle?

Back

50°.

Front

What type of triangle has one angle greater than 90 degrees?

Back

Obtuse triangle.

Front

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

Back

Acute triangle.