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8. tentukan jari jari dari keliling lingkaran
K = 2πr
154 = 2*22/7*r
r=49/2 cm
maka
V = luas alas x tinggi
= πr²t
= 22/7*49/2*49/2*20= 37.730 cm³
Tinggi = 42 cm
Volume = L.Lingk × t
= 154 × 42
= 6468 cm³
8. Kell lingk = 154 cm²
Tinggi = 20 cm
Mencari jari-jari
Kell = 2πr
154 = 2×22/7×r
r = 154×7/44
r = 24,5
Volume = πr²t
= 22/7 × 24,5² ×20
= 37730 cm³