Missing Angles in Triangles / Naming Triangles

Front

What is an obtuse triangle?

Back

A triangle that has one angle measuring more than 90 degrees.

Front

How many angles are in a triangle?

Back

Three angles.

Front

What is the sum of the angles in a triangle?

Back

180 degrees.

Front

What do we call two angles that add up to 90 degrees?

Back

Complementary angles.

Front

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

Back

A right triangle.

Front

What is an acute triangle?

Back

A triangle where all three angles are less than 90 degrees.

Front

If two angles in a triangle are 30 degrees and 70 degrees, what is the measure of the third angle?

Back

80 degrees.

Front

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

Back

60 degrees.

Front

What do we call a triangle with all sides of different lengths?

Back

Scalene triangle.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.