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6 September, 03:19

A ladder is placed against a wall of a building 20m above the ground. The foot of the ladder is 15m away from the bottom of the building. What is the length of the ladder?

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  1. 6 September, 03:31
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    By the Pythagorean Theorem:

    L^2=20^2+15^2

    L^2=400+225

    L^2=625

    L=25 m
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