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= 2x (p × l + l × t + p × t)
= 2x (15x8 + 8x10 + 15x10)
=2x (120+80+150)
=700
La = luas alas
St1 = sisi tegak 1
St2 = sisi tegak 2
Lp = [2 × La] + [2 × St1] + [2 × St2]
= [2 × [10 × 8] + [2 × [8 × 15] + [2 × [10 × 15]
= [2 × 80] + [2 × 120] + [2 × 150]
= 160 + 240 + 300
= 400 + 300
= 700 cm²
terima kasih semoga membantu ^_^
jadiin yang terbaik ya.