Let’s take an example
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Given a line
l
with point P not on it
2.Place set square on the line so that line is exactly above the set-square
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Put ruler on the hypotenuse side of the set square
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Keeping the ruler in the same position,
slide the set-square till one end of the set-square passes through point P
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Draw a line along the edge of the set square, keeping set-square firm
Let the line intersect line l at Q
Thus, PQ is the perpendicular to l