SOLUTION: if a rectangle is 3ft wide and 4ft long. how long is the diagonal of the rectangle?

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Question 273121: if a rectangle is 3ft wide and 4ft long. how long is the diagonal of the rectangle?
Answer by J2R2R(94) About Me  (Show Source):
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Rectangle is 3ft wide and 4ft long, we have a right-angled triangle which should be well known (3-4-5).

The hypotenuse (by Pythagoras) is the square root of the sum of the squares of the other two sides:

3x3 + 4x4 = 9 + 16 = 25

Therefore the hypotenuse is 5ft.

The diagonal (which is the hypotenuse) is 5ft long.