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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

now this is in square unit, to convert to normal find its square root which of 1681= 41
Hence answer= 41ft
include the steps
Ok just editing it