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9 x l = 36cm²
9l = 36 cm²
l = 36/9 = 4 cm
Jadi Lebarnya 4 cm.
Lp nya:
2(pl+pt+lt)
= 2((9x4)+ (9x8) + (4x8))
= 2(36+72+32)
= 2x140
= 280 cm²
Kalau salah maaf
t = 8 cm
l = 36 : 9 = 4 cm
LP = 2pt + 2pl + 2 lt
= 2(9.8) + 2(9.4) + 2(8.4)
= 2(72) + 2(36) + 2(32)
= 144 + 72 + 64
= 280