The angles of a pentagon are x 2x x 60 x 10 x -... - WAEC Mathematics 1991 Question
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 option: d
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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