Question

solve this question...............

Answer 1

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here,

angle y = angle a are .................(alternate angle)

angle a = angle x are .................(alternate angle)

and ,

angle a + b = 180° ................. (opposite angles)

angle x + y = 180° ..................( exterior alternate )

then angle a+b = x + y

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Answer 2

hello......
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x + y = a + b proved bcoz the angles lie exactly opposite to each other ( reason for proof )