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1/2 dari alas = 1/2 . 12 = 6 cm
tinggi bidang tegak = akar dr 24²+6²
= akar dr 576+36
= √612
= √36.17 = 6√17 cm
p.kerangka = 4.12 + 4.6√17
= 48 + 24√17
= 24(2+√27)