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38.V tabung = π.r².t
V kerucut = 1/3.π.r².t
maka
V kerucut = 1/3 V.tabung
V kerucut = 1/3 x 6.330
V kerucut = 2.110 dm³
jawaban C
39.
V.bola = 4/3.π.r.r.r
V = 4/3 x π x 6 x 6 x 6
V = 4 x π x 2 x 6 x 6
V = 288 π cm³
maka penambahan volume tabung adalah 288 π cm³
cari penambahan tinggi air
V = π.r².t
288.π = π. 10². t
288 = 100. t
t = 288 : 100
t = 2,88 cm
jawaban A