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qt2011
since both are right triangles you can use the Pythagorean Theorem.
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Jiography
Question (a):
cos(45°) = adjacent/hypotenuse
adjacent = hypotenuse × cos(45°)
adjacent = 7 × cos(45°)
adjacent = 4.9497474683
==> The foot of the ladder is 4.95m from the wall.