1.prisma dengan alas belah ketupat mempunyai panjang diagonal 10cm dan 24cm.jika tinggi prisma itu 20cm,maka luas permukaan prisma itu adalah...
liwonsubagyo
L alas = d1 x d2 2 = 10 x 24 2 = 120cm² sisi mereng = √ 12² + 5² = √ 144 + 25 = √169 = 13cm K.alas = 4 x s = 4 x 13 = 52cm L.permukaan = K.alas x t + 2 x L.alas = 52 x 20 + 2 x 120 = 1.040 + 240 = 1.280cm²
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nurma5
Lp limas= 2× luas alas + (keliling alas × tinggi) ^ luas alas = (diagonal 1 × diagonal 2) ÷ 2 = (10 × 24) ÷ 2 = 120 cm ^ kell. alas = (phytagoras): 24 ÷ 2 = 12, 10 ÷ 2 = 5 12, 5, =13 Kell.alas = 13 × 4 ( 4 sisi ) = 52 cm Luas permukaan prisma = 2 ×120 + (52 × 20) = 240 + 1040 = 1280cm2 Maaf, kalau salah.
2
= 10 x 24
2
= 120cm²
sisi mereng = √ 12² + 5²
= √ 144 + 25
= √169
= 13cm
K.alas = 4 x s
= 4 x 13
= 52cm
L.permukaan = K.alas x t + 2 x L.alas
= 52 x 20 + 2 x 120
= 1.040 + 240
= 1.280cm²