The area of circle A is 6.25 sq. in. If radius of the circle is doubled, what is the new area of circle A in sq. in?

The area of circle A is 6.25 sq. in. If radius of the circle is doubled, what is the new area of circle A in sq. in? Correct Answer 25 pi

Let, A এর radius = r ∴πr2 = 6·25π∴r = 2·5 Double হওয়ার পর 2π = 2·5×2 = 5 ∴ নতুন ক্ষেত্রফল π52 = 2·5π
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