YosafatZaenuriM
Ini yang nomor 1 dan 3, nomor 2 kurang ngerti.
Semoga sukses Maaf kalau salah.
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WidyaNurhidayah
13. Dik : tb(tinggi bangun) = 36 cm d = 1 4cm --> r = 7cm tt(tinggi tabung) = 1 2cm tk(tinggi kerucut) = 36-12 = 24 cm Dit : Volume bangun? Jawab : V = V. tabung+ V. kerucut = πr^2×tt + 1/3×πr^2×tk = πr^2 (tt + 1/3tk) = 22/7 × 7 × 7 (12+1/3 × 24) = 22×7 (12+8) = 154 (20) = 3080 cm^3 (b)
14. Dik : t prisma = 5 m alas∆ = 3 m t ∆= 2 m biaya per m^2 = 20.000 Dit : berapa biaya yang harus dibayar? Jawab : Lp tenda = 2×L.∆ + (K.alas-3) × t prisma
sisi tegak = √(3/2)^2 + 2^2 = √1,5^2 + 4 = √2,25 + 4 = √6,25 = 2,5 m
Semoga sukses
Maaf kalau salah.
d = 1 4cm --> r = 7cm
tt(tinggi tabung) = 1 2cm
tk(tinggi kerucut) = 36-12 = 24 cm
Dit : Volume bangun?
Jawab :
V = V. tabung+ V. kerucut
= πr^2×tt + 1/3×πr^2×tk
= πr^2 (tt + 1/3tk)
= 22/7 × 7 × 7 (12+1/3 × 24)
= 22×7 (12+8)
= 154 (20)
= 3080 cm^3 (b)
14. Dik : t prisma = 5 m
alas∆ = 3 m
t ∆= 2 m
biaya per m^2 = 20.000
Dit : berapa biaya yang harus dibayar?
Jawab :
Lp tenda = 2×L.∆ + (K.alas-3) × t prisma
sisi tegak = √(3/2)^2 + 2^2
= √1,5^2 + 4
= √2,25 + 4
= √6,25
= 2,5 m
Lp tenda = 2×L.∆ + (K.alas-3) × t prisma
= 2×1/2×a×t + (3+2,5+2,5-3) × 5
= 3 × 2 + (5) × 5
= 6 + 25
= 31 m^2
harga = 31 × 20.000 = 620.000
jadi, harga yang harus dibayar adalah Rp620.000,00 (b)
15. (a)tembereng