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In Fig, find the value of x. ltimg src...

In Fig, find the value of `x`.
ltimg src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PS_MATH_IX_C12_S01_032_Q01.png" width="80%"gt

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In the given figure, `angleCBE` is an exterior angle which is equal to the opposite interior angle at the opposite vertex, `angleADC`.
`therefore angleCBE=angleADC` (1)
`angleCBE + angleEBY=180^(2)` (`therefore` linear pair)
`therefore angleCBE=180^(@)-80^(@)=100^(@)`.
`x^(@) = angleADC = angleCBE=100^(@)`.
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