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Question -

In the figure, the value of y is
(a) 20°
(b) 30°
(c) 45°
(d) 60°



Answer -

In the figure,
 
y = x (Vertically opposite angles)
∠1 = 3x
∠2 = 3x
∴ 2(x + 3x + 2x) = 360° (Angles at a point)
2x + 6x + 4x = 360°
12x = 360° ⇒ x == 30°
∴ y = x = 30° (b)

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