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Question


Calculate the value of x in the above figure.
478539_4f433c3ed4934919b9dfc98dbf42776c.png

A
100o
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B
70o
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C
120o
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D
125o
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Solution

The correct option is A 100o
Since angles 2yo & 4yo form a linear pair, they must add up to 180o
So, 6y=180o or y=30o
Also, 4y=x+20, since these are vertically opposite angles.
120=x+20
x=100o

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