Maharashtra State BoardSSC (English Medium) 9th Standard
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Find the Following Ratios. the Ratio of Circumference of Circle with Radius R To Its Area. - Algebra

Sum
Find the following ratio.
The ratio of circumference of circle with radius r to its area.
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Solution

Radius of the circle = r units
∴ Circumference of the circle = 2πr units
Area of the circle = πr2 square units
Circumference of the circle : Area of the circle =
`2πr : πr^2 = (2πr) / (πr^2) = 2/r = 2 : r`
Thus, the ratio of circumference of circle with radius r to its area is 2 : r.

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Balbharati Mathematics 1 Algebra 9th Standard Maharashtra State Board
Chapter 4 Ratio and Proportion
Practice Set 4.2 | Q 2.2 | Page 63
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