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48 cm : 8 = 6 cm
maka volumenya adalah:
v = s x s x s
= 6 x 6 x 6
= 216 cm³
33. v. tabung = π x r x r x t
= 22/7 x 7 x 7 x 10
= 1.540 cm³
v. kerucut = 1/3 x 22/7 x 7 x 7 x 9
= 22/7 x 7 x 7 x 3
= 22 x 7 x 3
= 462 cm³
v. gabungan = v. tabung + v. kerucut
= 1.540 + 462
= 2002 cm³
34. ∑(x)= x₁.f₁ + x₂.f₂ / f₁ + f₂
70 = 8. 69 + x₂. 2 / 10
70 x 10 = 552 + x₂. 2
x₂. 2 = 700 - 552
x₂. 2 = 148
x₂ = 148 : 2
x₂ = 74
maka nilai rata-rata 2 orang anak yg mengikuti ulangan susulan adalah 74.