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In the given figure t is a transversal to line l and m. The angels a and b are forming​

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In the given figure. l∥ m and t is a transversal. If ∠1 and ∠2 are in the ratio 5:7, find the measure of each of the angle ∠1,∠2,∠3 and ∠8

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Two parallel lines l and m be cut a transversal t, forming angles.

It is given that ∠1:∠2=5:7

Let the measures of angles by 5x and 7x,

Then,

5x+7x=180

12x=180

x=180/12

x=15