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Question -

In the figure, the value of x is
(a) 12
(b) 15
(c) 20
(d) 30



Answer -

∠1 = 3x+ 10 (Vertically opposite angles)
But x + ∠1 + ∠2 = 180°
 
⇒ x + 3x + 10° + 90° = 180°
⇒ 4x = 180° – 10° – 90° = 80°
x == 20   (c)

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