Triangle interior & exterior

Front

What is the sum of the interior angles in a triangle?

Back

180 degrees.

Front

If one angle in a triangle is 87 degrees, what is the measure of the other two angles if the sum must equal 180 degrees?

Back

The other two angles must sum to 93 degrees.

Front

What is the measure of the indicated angle if the options are 145, 113, 102, 78 and the correct answer is 102?

Back

The indicated angle measures 102 degrees.

Front

What is the Triangle Inequality Theorem?

Back

The sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

Front

If a triangle has side lengths of 13 and 4, what is a possible length for the third side?

Back

12 is a possible length for the third side.

Front

What is the definition of an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is the definition of an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

What is the definition of a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

In a triangle, if angle A is the smallest angle, what can be said about the lengths of the sides opposite the angles?

Back

The side opposite angle A is the shortest side.

Front

What is the exterior angle theorem?

Back

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