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Question

In the adjoining figure, ∠a = (120 - x)o and ∠b = 5xo, the measures of ∠a and ∠b.


A

125o, 55o

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B

52o, 65o

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C

75o, 75o

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D

100o ,100o

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Solution

The correct option is D

100o ,100o


The corresponding angles are equal

(120 - x)o = 5xo
6x = 120o

x = 20o

a = 120o- 20o= 100o, b = 5 x 20o = 100o


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