The angles of a pentagon are x°, 2x°, (x + 60)°, (x + 10)°, (x...
MATHEMATICS
WAEC 1991
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
Correct Answer: D. 80
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°
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