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= 2 × 7 cm
= 14 cm
t = 2 × d
= 2 × 14 cm
= 28 cm
Volume = π × r² × t
= 22/7 × 7² × 28
= 22/7 × 49 × 28
= 22 × 7 × 28
= 154 × 28
= 4.312 cm³
2) r = d : 2
= 20 dm : 2
= 10 dm
Luas alas = π × r²
= 3,14 × 10²
= 3,14 × 100
= 314 dm²
Tinggi = Volume : Luas alas
= 4.710 dm³ : 314 dm²
= 15 dm
V = x 7² x 28
= 22 x 7 x 28= 4312 cm³
2. 3,14 x 100 = 314 cm²
4710 : 314 = 15 dm