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find the width of a rectangle with a diagonal and lenght of 20cm and 15cm respectively?

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w^2 + 15^2 = 20^2 ----- simple Pythagoras
w^2 + 225 = 400
etc

a rectangle is 5cm longer than it is wide. the diagonal of the rectangle is 20 cm. determine the dimensions of the rectangle. explain and show your work

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