Triangle Sum and Exterior Sum

Front

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

Back

180°

Front

Solve for x: 2x + 5 = 19.

Back

x = 7

Front

What is the measure of angle x if angle y = 30° and angle z = 45°?

Back

x = 105°

Front

Which of the following angles can you add together to equal angle d? Angle a = 30°, Angle b = 60°, Angle c = 90°.

Back

Angle a and Angle b (30° + 60° = 90°)

Front

Find the value of x by using the exterior angle theorem: If angle A = 50° and angle B = 60°, what is angle C?

Back

C = 110°

Front

What is the definition of an exterior angle in a triangle?

Back

An exterior angle is formed by one side of a triangle and the extension of an adjacent side.

Front

If angle A = 40° and angle B = 70°, what is angle C?

Back

C = 70° (180° - 40° - 70° = 70°)

Front

What is the relationship between the exterior angle and the two opposite interior angles?

Back

The exterior angle is equal to the sum of the two opposite interior angles.

Front

If angle x = 45°, what is the measure of the other two angles in a right triangle?

Back

The other two angles must sum to 135°.

Front

What is the formula to find the sum of angles in a triangle?

Back

The sum of angles in a triangle = 180°.