Question

20. The diagram shows a supplementary angle. Determine the value of x. *

Answer 1

C

Explanation:

supplementary angles sum to 180° , then

3x + 15 + 60 = 180 , that is

3x + 75 = 180 ( subtract 75 from both sides )

3x = 105 ( divide both sides by 3 )

x = 35