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keliling = 2 ( P + L)
2 ( P + 5/8 P ) = 78
8/8P + 5/8P = 78/2
13/8P = 39
P = 8/13 * 39 = 24Cm
L = 5/8 * 24 = 15cm
Luas = P*L = 24*15 = 360cm²