Berapa ukuran diameter luas alas dan volume jika ukuran jari-jari 21 dan tinggi tabung 25

[tex]v = \pi {r}^{2} t \\ > \frac{22}{7} \times 21 \times 21 \times 25 \\ = 1386 \times 25 \\ = 34650 \: {cm}^{3} [/tex]
[tex]luas \: alas = 1386 \: {cm}^{2} \\ diameter = 42 \: cm[/tex]

Dik: r = 21 => d = 42
t = 25
L = πr2
= 22/7 x 21 x 21
= 1386 cm2
V = 1/4 π d2t
= 1/4 x 22/7 x 42 x 42 x 25
= 34.650 cm3