Measuring angles

Front

What is an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

Tags

CCSS.4.G.A.1

Front

What is the unit of measurement for angles?

Back

Angles are typically measured in degrees (°) or radians.

Tags

CCSS.4.MD.C.6

Front

What is a right angle?

Back

A right angle measures exactly 90 degrees.

Tags

CCSS.4.G.A.1

Front

What is an acute angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is an obtuse angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Tags

CCSS.4.G.A.1

Front

What is a reflex angle?

Back

A reflex angle is an angle that measures more than 180 degrees but less than 360 degrees.

Tags

CCSS.4.G.A.1

Front

How do you classify angles based on their measurements?

Back

Angles can be classified as acute (<90°), right (=90°), obtuse (>90° and <180°), straight (=180°), and reflex (>180° and <360°).

Tags

CCSS.4.G.A.1

Front

What is the sum of angles in a triangle?

Back

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

Tags

CCSS.8.G.A.5

Front

What is the relationship between complementary angles?

Back

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

Tags

CCSS.7.G.B.5