l p balok
= 2(pt+lt+pt)-s²
= 2 (162+117+234)
= 2 × 513 - 81
= 945 cm²
l p kubus
= 5 × s²
= 5 × 81
= 405 cm²
l p gabungan
= 945 + 405
= 1.350 cm²
ehek janjiny ya :]
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l p balok
= 2(pt+lt+pt)-s²
= 2 (162+117+234)
= 2 × 513 - 81
= 945 cm²
l p kubus
= 5 × s²
= 5 × 81
= 405 cm²
l p gabungan
= 945 + 405
= 1.350 cm²
ehek janjiny ya :]