Question

The circumference of the Base of a cylinder is 220 cm. If the height is 2 m, find the surface area of the cylinder.

Answer 1

C=220cm
=2.2m
C=2πr
2.2=2×22÷7×r
2.2×7÷44=r
r=0.35m
SA of cylinder=2πrh
=2×22÷7×0.35×2
=4.4m/2
Maybe I'm wrong

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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