Question

Find the surface area of a cylinder
whose radius is 5 cm and whose
height is 10 cm.
Round to the nearest whole number.
[?] cm2

Answer 1

Question:-

Find the surface area of a cylinder

whose radius is 5 cm and whose

height is 10 cm.

Answer:-

Given:-

$\bullet$ Radius of a cylinder (r) is 5 cm

$\bullet$ Height of a cylinder (h) is 10 cm

To Find:-

The surface area of a cylinder

Solution:-

We know the formula of surface area of a cylinder is –

${ \boxed{\rm \red {2πr² \: + \: 2πrh}}}$

So, putting the value of r = 5 cm and h = 10 cm we get,

2πr(r + h) = 2 × $\frac{22}{7}$ × 5(5 + 10)

= $\frac{220}{7}$(5 + 10)

= $\frac{220}{7}$ × 15

= $\frac{220 \: × \: 15}{7}$

= $\frac{3300}{7}$

= 471.43 cm²

The surface area of a cylinder is 471.43 cm². [Answer]