Lesson 2: Angles and Triangles

Question

Angle A and B are supplementary.

If angle A is equal to 20 degrees and angle B is equal to 2x +10, what is the value of x?

Supplementary Angles Photo.PNG

(1 point)



Group of answer choices

x= 75

x= 90

x =160

x= 180

Answer 1

Since the angles are supplementary, their sum must be 180 degrees.

20 + 2x + 10 = 180
2x + 30 = 180
2x = 150
x = 75

Therefore, the value of x is 75.

So, the correct answer is x = 75.