Understanding Angles and Triangles

Front

What is an acute angle?

Back

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

Front

What is an obtuse angle?

Back

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

Front

What is a right angle?

Back

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

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

What is the sum of the angles in a triangle?

Back

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

Front

How do you find the length of a missing side in a right triangle?

Back

Use the Pythagorean theorem: a² + b² = c², where c is the hypotenuse.

Front

What is the measure of the third angle if two angles in a triangle are 76 degrees and 86 degrees?

Back

The third angle measures 18 degrees (180 - 76 - 86 = 18).

Front

What is the formula for finding the area of a triangle?

Back

Area = 1/2 * base * height.

Front

What is the relationship between the angles in complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What is the relationship between the angles in supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.