Question

find c.s.a of cylinder r=x,h=y

Answer 1

$h = 4 \\ 2\pi \: r = 11 \\ r = \frac{11}{2\pi} = \frac{11 \times 7}{2 \times 22} = \frac{7}{4} \\ v = \pi {r}^{2} h \\ = \frac{22}{7} \times \frac{7 \times 7}{4 \times 4} \times 4 \\ = \frac{22 \times 7}{4} \\ = \frac{77}{2} \\ = 38.5 {cm}^{3}$