Question

The circumference of the base of a right circular cylinder is 220 cm. If the height of the cylinder is 2 m,
find the lateral surface area of the cylinder.​

Answer 1

2pir=220

2×22/7×r=220

r=7/44×220

r=35cm

LSA of cylinder=2pirh

2×22/7×35×2

44/7×35×2

=440cm2

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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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