Question

a circumference of the base of the right circular cylinder is 220 CM if the height of the cylinder is 2 metre find the lateral surface area of the cylinder
$2\pi \: rh$

Answer 1

circumference of circle = 2πr

220 cm = 2πr

220/2 = πr

110 = πr

110 ÷ π = r

110 ÷ 22/7 = r

110 × 7/22 = r

r = 35 cm

lateral surface area = 2πrh

= 2 × 22/7 × 35 × 2×100

= 44000 cm^2

Answer 2

$\huge \underline \mathsf \red {Solution:-}$

Let the height and radius of the cylinder be h and r cm respectively.

Given:

• Height is 2m = 200cm

As, circumference of base = 220

2πr = 220

➠ $\mathsf {2 \times\frac{22}{7} \times r = 220}$

r = 35 cm

➠ $\mathsf {2 \times\frac{22}{7} \times 35 \times h}$

➠ $\mathsf {2 \times\frac{22}{7} \times 35 \times 220}$

As, Lateral surface of cylinder = 2πrh

= 44000 cm²

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