Daniel V. answered • 12/07/14

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if you think of a rectangle as two triangles you will understand what the diagonal is for.

5 is the hypotenuse of the triangle

if the area of the rectangle is 12 the possible side lengths are

1 and 12

2 and 6

3 and 4

to see what fits you need the Pythagorean formula a^2 + b^2 = c^2

if c^=25 it cant be the first two because 12^2 and 6 ^2 are more than 25 which needs to be the largest

so the side lengths are 3 and 4

3*4= 12 and 3^2 + 4^2 = 5^2