Question

the surface area of cylinder is 4620cm and its radius is 21cm find its height ​

Answer 1

Solution

Given

surface area of cylinder=4620cm

formula=

$2\pi \: r(h + r)$

$4620 = 2 \times \frac{22}{7} \times 21(h + 21)$

$4620 = 132 \times 21h$

$21h = \frac{4620}{132 } = 35$

$h = \frac{35}{21 } = 1.67cm$