In the figure above, if x:y=2:1, then x = ?
a) 15
b)20
c)25
d)30
e)35
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Total angle = y+3y+2x+2x
given, x = 2y
Total angle = y+3y+4y+4y = 12y = 180°
y = 180°/12 = 15°
∵ x = 2y
x = 2x(15°) = 30°
option (d)
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