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In Fig., the value of x is

A. 12

B. 15

C. 20

D. 30

1 Answer

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Best answer

Let,

AB, CD and EF intersect at O

∠COB = ∠AOD (Vertically opposite angle)

∠AOD = 3x + 10 (i)

∠AOE + ∠AOD + ∠DOF = 180°(Linear pair)

x + 3x + 10° + 90° = 180°

4x + 100° = 180°

4x = 80°

x = 20°

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