Using Equations to Solve for Unknown Angles

Front

What is an angle?

Back

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

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 a right angle?

Back

A right angle is an angle that 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 does it mean to solve for an unknown angle?

Back

To solve for an unknown angle means to find the measure of that angle using equations or relationships between angles.

Tags

CCSS.7.G.B.5

Front

What is the equation for complementary angles?

Back

Two angles are complementary if their measures add up to 90 degrees.

Tags

CCSS.7.G.B.5

Front

What is the equation for supplementary angles?

Back

Two angles are supplementary if their measures add up to 180 degrees.

Tags

CCSS.7.G.B.5

Front

How do you set up an equation to find an unknown angle?

Back

Identify the relationship between the known angles and the unknown angle, then write an equation based on that relationship.

Tags

CCSS.7.G.B.5

Front

If angle A + angle B = 90 degrees, what can you say about angles A and B?

Back

Angles A and B are complementary angles.

Tags

CCSS.7.G.B.5