Question

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

Answer 1

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Circumference of Base = 220

So,

$2 \: \pi \: r = 220$

Therefore,

r = 220/ 2 π

r = 35 cm .......... ( 1 )

Now,

CSA of Cylinder = 2πrh

=>( 2 × 22/7 × 35 × 2000) cm

=> 440, 000 cm^2

=> 440 m^2 ..................ANS

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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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