Triangle Sum Theorem

The Triangle Sum Theorem states that the sum of all angles in a triangle is ______. 

• 45°
• 90°
• 180°
• 360°

Find the measure of the angle indicated. 

• 139°
• 66°
• 138°
• 116°

What is the third angle of a triangle whose 1st angle is 79 and the 2nd angle is 43?

• 43
• 58
• 72
• 101

Find the measure of the missing angle.

• 90^o
• 10⁰
• 130^o
• 50^o

Solve for x.

• 16
• 11
• 50
• 6

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

Find the measure of the indicated angle. 

• 34
• 46
• 62
• 36

Solve for x.

• 6
• -10
• 7
• -9

Using the Exterior Angle Theorem, find the measure of angle b?

• 36^o
• 56^o
• 63^o
• 117^o

Find the value of x by using the exterior angle theorem.

• A
• B
• C
• D