Using order of operations, the exponent comes first.
48^2 = 2304
Then half would divide it by 2.
2304/2 = 1152
So your answer is 1152 cm.
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P = 48cm
48cm x 78cm is 3744 square cm or 4.03 square feet.
It's half a mile
P = 48cm
3.634 cm