Prove that, if a line is perpendicular to one of the two parallel lines, then it is perpendicular to the other line also ?

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Solution

To prove if $A D$ perpendicular to $M N$ , it is also perpendicular to $O P$

$A B N = 90^{o}$ ( SInce AD is perpendicular to MN)
$B C P = A B N = 90^{o}$

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