Missing Angles in Triangles

Front

What is an acute triangle?

Back

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

Front

What is an obtuse triangle?

Back

A triangle that has one angle greater than 90 degrees.

Front

What is a right triangle?

Back

A triangle that has one angle equal to 90 degrees.

Front

What is an equiangular triangle?

Back

A triangle where all three angles are equal, each measuring 60 degrees.

Front

What is the sum of the angles in a triangle?

Back

The sum of the interior angles in a triangle is always 180 degrees.

Front

If one angle in a triangle is 90 degrees, what is the sum of the other two angles?

Back

The sum of the other two angles is 90 degrees.

Front

How do you find the measure of a missing angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What type of angle is 180 degrees?

Back

A straight angle.

Front

What is the measure of the third angle in a right triangle if one angle is 43 degrees?

Back

The third angle measures 47 degrees.

Front

If two angles in a triangle measure 45 degrees and 75 degrees, what is the measure of the third angle?

Back

The third angle measures 60 degrees.