Question

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Prove ⤵️

Diagram "

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Perpendicular lines intersect to form four right angles..

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Answer 1

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$\bold{Perpendicular \:lines\: intersect\: to\: form \:four\: right\: angles..}$

Since ∠A and ∠B add up to a straight line, A+B=180°

Similarly, B+C=180°, C+D=180° and D+A=180°.

If A=90° then B= 90°

∴ C= 90°

∴D=90°

$\huge\boxed{Hense\:Proved !!!}$