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Verified answer
Lp balok I= 2(pl + pt + lt)
= 2(12(10) + 12(20) + 20(10))
= 2(120 + 240 + 200)
= 2(560)
= 1120 cm²
lp balok II
= 2(pl + pt + lt)
= 2(8(15) + 8(18) + 15(18))
= 2(120 + 144 + 270)
= 2(534)
= 1068 cm²
Selisih lp kedua balok
= 1120 - 1068
= 52 cm²
=(2 × 12 × 10) + (2 × 12 × 20) + (2 × 10 × 20)
=240 + 480 + 400
=1.120 cm^2.
Lpbalok B=(2 × p × l) + (2 × p × t) + (2 × l × t)
=(2 × 8 × 15) + (2 × 8 × 18) + (2 × 15 × 18)
=240 + 288 + 540
=1.068 cm^2.
Selisih=Lpbalok A - Lpbalok B
=(1.120 - 1.068)cm^2.
=52 cm^2.
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