The angles of a pentagon are x°, 2x°, (x + 60)°, (x + 10)°, (x -10)°. Find the value of x.
- A.
40 - B.
60 - C.
75 - D.
80 - E.
90
Correct Answer: Option D
Explanation
Sum of ∠s in a pentagon = (n – 2)180 = 540°
x° + 2x° + x° + 60° + x° + 10° + x° – 10° = 540°
6x° + 60° = 540°; x = 80°