jari jari suatu tangki 70cm,jika tinggi tangki 3meter,tentukan luas tangki tanpa tutup dan volume

Luas tangki = Luas alas + luas selimut
Luas tangki =
[tex]\pi {r}^{2} + 2\pi \: r t \\ \frac{22}{7} \times 0.7 \times 0.7 + (2 \times \frac{22}{7} \times 0.7 \times 3) \\ 1.54 + 13.2 \\ 14.74 {m}^{2} [/tex]
volume =
[tex]\pi {r}^{2} t \\ \frac{22}{7} \times 0.7 \times 0.7 \times 3 = 4.62 {m}^{3} [/tex]

r = 70 cm = 7 dm
t = 3 x 100 = 300 cm = 30 dm
π = 22/7

Lp.tt = 22/7 x 7 x ( 7 + 2x30)
= 22 x 67 = 1.474 dm²

V = 22/7 x 7² x 30
= 154 x 30
= 4.620 liter