4th Grade Module 4 Review

Front

What is an angle?

Back

An angle is formed by two rays (sides) that share a common endpoint (the vertex). It is measured in degrees (°).

Front

What does a right angle measure?

Back

A right angle measures 90 degrees (90°).

Front

What does an acute angle measure?

Back

An acute angle measures less than 90 degrees (90°).

Front

What does an obtuse angle measure?

Back

An obtuse angle measures more than 90 degrees but less than 180 degrees (90° < angle < 180°).

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees (180°).

Front

How many lines of symmetry does a square have?

Back

A square has 4 lines of symmetry.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is a complementary angle?

Back

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

Front

What is a supplementary angle?

Back

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

Front

What is the formula to find the measure of an unknown angle x in a triangle?

Back