Finding the Missing Angle of a Triangle

Find missing angles in a Triangle

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The Sum of the Angles of a Triangle

all 3 angles add to 180 degrees.

Multiple Choice

Find the measure of each angle indicated. 

• 139°
• 66°
• 138°
• 116°

Multiple Choice

Work out the size of the missing angle

• 22

• 202

• 20

• 158

Multiple Choice

A triangle's angles add up to...

• 90 Degrees
• 180 Degrees
• 360 Degrees
• OVER 9000 Degrees

Multiple Choice

Find the measure of the missing angle.

• 139°
• 66°
• 138°
• 116°

Multiple Choice

Find the measure of the missing angle.

• 47

• 57

• 53

• 133

Set up an equation to solve for x

Multiple Choice

Solve for x.

• 16

• 11

• 50

• 6

Multiple Choice

A triangle has angles on x, 3x, and x + 25. What is the value of x?

• 155

• 51.67

• 31

• 6.2