Question : The circumference of a circle is 220 cm. What is the area of that circle?
Option 1: 3850 cm2
Option 2: 4550 cm2
Option 3: 2850 cm2
Option 4: 4650 cm2
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Correct Answer: 3850 cm 2
Solution : The circumference $C$ of a circle, where $r$ is the radius of the circle. $C = 2 \pi r$ Given that the circumference $C$ is 220 cm. So, $r = \frac{C}{2 \pi} = \frac{220}{2 \pi} =35$ cm The area $A$ of a circle, $A = \pi r^2$ Substituting r = 35 cm into the formula, $A = \pi (35)^2 = 3850$ cm 2 Hence, the correct answer is 3850 cm 2 .
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