Triangle Sum Theorem Worksheet

Triangle Sum Theorem Worksheet

Read each question carefully and answer to the best of your ability. Remember that the sum of the angles in any triangle is always 180 degrees.

1. If two angles of a triangle measure 60° and 70°, what is the measure of the third angle?

2. An equilateral triangle has three equal angles. What is the measure of each angle?

1. The sum of the interior angles of any triangle is always   degrees.

2. If a triangle has angles measuring 45° and 90°, the third angle must be   degrees.

1. A triangle can have two obtuse angles.

2. An isosceles triangle always has three equal angles.

1. A triangle has angles that measure x, 2x, and 3x. What is the value of x?

2. Explain why a triangle cannot have two right angles.