Finding the missing angle of a triangle

Finding the missing angle of a triangle

Triangle Sum Theorem

The angles of a triangle must have a sum of 180 degrees.

Multiple Choice

Find the missing angle.

• 25

• 35

• 55

• 180

Multiple Choice

Angles that are exactly 90 degrees are called _____ ______.

• tight angles
• acute angles
• obtuse angles
• right angles

Multiple Choice

In a triangle, how many total degrees are there?

• 100%
• 180 degrees
• it varies
• 360 degrees

Multiple Choice

If all three angles are exactly the same measure, how big is each angle?
Hint:    x + x + x  = 180

• 180 degrees
• 90 degrees
• 50 degrees
• 60 degrees

Multiple Choice

Find the measure of the angle indicated. 

• 139°
• 66°
• 138°
• 116°

Multiple Choice

What is the measure of the missing angle?

• 140
• 130
• 50
• 90