Mathematics
WAEC 2003
The four interior angles of a quadrilateral are (x + 20)
o, (x+ 10)
o (2x - 45)
o and (x - 25)
o. Find the value of x
-
A.
60
-
B.
80
-
C.
100
-
D.
360
Correct Answer: Option B
Explanation
Sum of interior angles in a quadrilateral is 360
(x + 20)o + (x+ 10)o + (2x - 45)o + (x - 25)o = 360o
5xo - 40o = 360o
x = 400/5 = 80o
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