1.

Can anyone tell the steps to take out the correct answer?

Answer»

Radius of biggest CIRCLE is 3X cm.
a) so circumference
2\pi \times 2x \: \: cm = \: 4\pi \times x \: \: cm
b)REQUIRED circumference in this CASE
=
(\pi \times 2x + \pi \times x) \times 2 = 6\pi \times x \: \: cm
similarly \: area \: of \: the \: shaded \: region \: = \\ (\pi \times {2x}^{2} \times \frac{1}{2} - \pi \times {x}^{2} \times \frac{1}{2} ) \times 2 \\ = 3\pi \times {x}^{2} \: {cm}^{2}
hope you get your answer.


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