A) area = length * height
B) height = .5 * length
Substituting equation B into A
A) area = length * .5 * length
1,152 = length * .5 * length
1,152 = .5*length^2
.5*length^2 -1,152 = 0
length = 48
height = 24
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Double-Check
area = 48 * 24 = 1,152