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p = 5 + 2l
K = 28 m
Maka,
K = 2(p + l)
28 = 2(p + l)
14 = p + l
Masukkan p,
14 = p + l
14 = (5 + 2l) + l
14 = 5 + 3l
14 - 5 = 3l
9 = 3l
l = 9/3
l = 3 m
Masukkan l,
14 = p + l
14 = p + 3
p = 14 - 3
p = 11 m
Sehingga,
L = p x l
L = 11 x 3
L = 33 m²
Semoga membantu . . .