C Sebuah limas segiempat dengan panjang AB = CD = 30 cm, panjang AD = BC = 14 cm, dan panjang AT = BT = CT = DT = 25 cm. Jika bagian alas limas terdapat lubang berdiameter 14 cm, tentukan luas permukaan limas
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Penjelasan dengan langkah-langkah:
cari panjang tinggi sisi tegak segitiga dulu
t² = AT² - (1/2×AB)²
t = √(25²) - (1/2×30)²
t = √400
t = 20 cm²
Lp = (1/2×AB×tsegitiga×4) + ((AD×AB)-(1/4×π×d2))
LP = (1/2×30×20×4) + ((14×30)-(1/4×22/7×14×14))
LP = (15×20×4) + ((420)-(154))
LP = 1.200 + 266
LP = 1.466 cm²