Penjelasan dengan langkah-langkah:
Lebar => 240÷3 = 80
15) LP
= L.Alas&L.Atap + L.S balok kiri + L.S balok tengah + L.S balok kanan + L.atap
= 2(240.80) + 3(20.80) + ( 2(90.80) + 80(70+40)) + 3(50.80)
= 2(19200) + 3(1600) + (2(7200)+80(110)) + 3(4000)
= 38400 + 4800 + (14400+8800) + 12000
= 78400 cm²
Cara 2
LP
= L Balok penuh - L irisan + L selimut tambahan
= ( 2(240.80+240.90+90.80)) + (3(70.80)+3(40.80) + 80(70+40)
= (2(19200+21600+7200))+(3(5600+3200)+80(110)
= 2(48000) - 3(8800) + 8800
= 96000 - 26400 + 8800
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Verified answer
Penjelasan dengan langkah-langkah:
Lebar => 240÷3 = 80
15) LP
= L.Alas&L.Atap + L.S balok kiri + L.S balok tengah + L.S balok kanan + L.atap
= 2(240.80) + 3(20.80) + ( 2(90.80) + 80(70+40)) + 3(50.80)
= 2(19200) + 3(1600) + (2(7200)+80(110)) + 3(4000)
= 38400 + 4800 + (14400+8800) + 12000
= 78400 cm²
Cara 2
LP
= L Balok penuh - L irisan + L selimut tambahan
= ( 2(240.80+240.90+90.80)) + (3(70.80)+3(40.80) + 80(70+40)
= (2(19200+21600+7200))+(3(5600+3200)+80(110)
= 2(48000) - 3(8800) + 8800
= 96000 - 26400 + 8800
= 78400 cm²