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atau 2 (P + L)
2 (P + L) = 78
2 (8x + 5x) = 78
2 (13x) = 78
26x = 78
x = 78 / 26
x = 3
Panjang = 8 * 3 = 24 cm
Lebar = 5 * 3 = 15 cm
Luas = PL
= 24 * 15
= 360 cm²