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the answer and step by step explainations are there in this image
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as height of building will be perpendicular distance from the wall to rope will be base and required length of rope will be hypotenuse. so by Pythagoras theorem of hypotenuse
=√(16×16+12×12)
√(256 + 144)
=√400=√20²
=20m
then height of rope is 20m
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