Question

Hi in find the radius of the cylinder whose lateral surface area is 80 n cm 2 and height is 8 cm

Answer 1

lateral surface area of a cylinder = 2πrh

$80 \: \: \: \: = \: \: \: \: 2 \times \frac{22}{7} \times r \times 8 \\ \\ \frac{80 \times 7}{2 \times 22 \times 8} = \: r \\ \\ \frac{35}{22} = r \\ \\ 1.59cm \: = r$