Triangles (Angle Sum Theorem, and Classifying)

What do the angles in an equilateral triangle measure?

• 30, 60, 90
• 45, 45, 90
• 60, 60, 60
• 35, 55, 90

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

• 45°
• 90°
• 180°
• 360°

The Triangle Sum Theorem deals with _______ of a triangle

• angles
• sides

Find the measure of each angle indicated. 

• 33°
• 136°
• 36°
• 31°

Find the measure of each angle indicated. 

• 140°
• 21°
• 105°
• 25°

Find the measure of each angle indicated. 

• 139°
• 66°
• 138°
• 116°

Find the measure of each angle indicated. 

• 40°
• 33°
• 30°
• 29°

Solve for x.

• -12
• -8
• -10
• -5

Solve for x.

• 16
• 11
• 50
• 6

Find the value of x for this equilateral triangle

• 6

• 4

• -4

• 5