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Question

In the figure, if l1||l2, what is the value of y?


Solution

In the figure, if l1||l2 and l3 is the transversal


x+y=1800 ...(i)
(Linear pair)
1=y ...(ii)
(Corresponding angles) 
1=3x ...(ii)
(Vertically opposite angles)
y=3x (iv)
Now, x+y=1800
x+3x=1800
4x=1800
x=18004=450
y=3x=3×450=135


Mathematics
RD Sharma
Standard IX

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