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A man wafts to reach up a window 40 ft. from the ground. The distance from the foot of the ladder to the wall is 9 feet. How long should the ladder be?

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This is an application of pythagoras theorem

Here dist. from ladder foot to wall=9ft height of window=40ft

to find length of ladder, find length of hypotenuse

to find c square the formula= a square+ b square

Here a=9ft, b=40ft 81+1600=1681

now this is in square unit, to convert to normal find its square root which of 1681= 41 Hence answer= 41ft