The perimeter of the rectangle is 24cm. A square was formed from 5 such rectangles. What is the area of a square?

The solution looks like this:
P straight = 2 x [a + b]
2 x [a + b] = 24
a + b = 12
h = 5 a
a + 5a = 12
6a = 12 a = 2
h = 10cm
s = 100cm2

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