Latihan 5.2 Kerucut Halaman 293 Kelas 9 Halaman 293 Nomor 1 - 10 Lengkap dengan Pembahasan Kunci Jawaban

a. Diketahui :
V = 300 π m3
r = 10 m
t = ?

1/3.πr2.t = V
πr2.t = 3.V
π.10 m.10 m.t = 3.300 π
t = 900 m3/100 m2
t = 9 m

b. Diketahui :
V = 120 π m3
t = 10 m
r = ?

1/3.πr2.t = V
πr2.t = 3.V
πr2.10 m = 3.120. π m3
r2 = 360 m3/10 m
r2 = 36
r = 6 m

c. Diketahui :
d = 16 cm
r = 8 cm
L = 180 π cm2
t =?

πr (s + r) = L
π.8 cm (s + 8 cm) = 180 π
s + 8cm = 180 cm2/ 8 cm
s + 8 cm = 22,5 cm
s = 22,5 cm - 8 cm
= 14,5 cm

t2 = 14,5^2 - 8^2
= 210,25 - 64
= 146,25
t = V146,25
= 12,09 cm

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d. Diketahui :
t = 12 dm

r2 = 15^2 - 12^2
r = V225 - 144
= V81
= 9 dm