Jawaban:
Lp= 920 cm² (B)
Penjelasan dengan langkah-langkah:
Lp(prisma) = L(ADEF) + 2×L(ABF) + L(ABCD)
+ L(BCEF)
L(ADEF) = P × L = 20 × 8 = 160 cm²
L(ABF) = ½ a×t = ½ × 15×8 = 60 cm²
Karna BF belum diketahui, perhatikan ∆ABF, gunakan phytagoras.
BF = √AB²+AF²
= √15² + 8² = √225 + 64 = √289=17
L(BCEF) = 20 × 17 = 340 cm²
L(ABCD) = 20 × 15 = 300 cm²
Dapatlah:
Lp = 160 + 2×60 + 340 + 300 = 280 + 640 = 920
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Jawaban:
Lp= 920 cm² (B)
Penjelasan dengan langkah-langkah:
Lp(prisma) = L(ADEF) + 2×L(ABF) + L(ABCD)
+ L(BCEF)
L(ADEF) = P × L = 20 × 8 = 160 cm²
L(ABF) = ½ a×t = ½ × 15×8 = 60 cm²
Karna BF belum diketahui, perhatikan ∆ABF, gunakan phytagoras.
BF = √AB²+AF²
= √15² + 8² = √225 + 64 = √289=17
L(BCEF) = 20 × 17 = 340 cm²
L(ABCD) = 20 × 15 = 300 cm²
Dapatlah:
Lp = 160 + 2×60 + 340 + 300 = 280 + 640 = 920