Question

Find the radius of a cylinder of height 21cm and volume 3234 cu cm.

Answer 1

Step-by-step explanation:

$volume \: of \: a \: cylinder = \pi {r}^{2} h \: \: \: cubic \: unit$

ATP,

$\pi {r}^{2} h = 3234$

$\frac{22}{7} \times {r}^{2} \times 21 = 3234$

${r}^{2} \times 66 = 3234$

${r}^{2} = \frac{3234}{66}$

${r}^{2} = 49$

$r = \sqrt{49}$

$r = 7$

Answer :- Radius of a cylinder is 7cm.

Answer 2

Answer:

7 cm

Step-by-step explanation:

Volume = 3234 cu. cm

Height = 21 cm

∴  Volume = π  r² × h

  3234 = 22/7 r² × 21

  3234 = 22 × 3 × r²

  3234 = 66 × r²

  3234 ÷ 66 = r²

  49 = r²

  √49 = r

  7 = r

∴ Radius = 7 cm