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The area of a circle is calculated by multiplying pi by r2. Where r = the radius of the circle.
IF we use 3.1416 as our value of pi, this means that a circle with a radius of 1 inch has an area of 3.1416 square inches. Rounding this to one decimal place gives us 3.1 square inches.
Other radius - area ratios are
2 .......... 12.5665 - rounded = 12.6
3 .......... 28.2744 - rounded = 28.3
4 .......... 50.2656 - rounded = 50.3
5 .......... 78.54 - - - rounded = 78.5
6 ......... 113.0976 - rounded = 113.1
7 ......... 153.9384 - rounded = 153.9
8 ......... 201.0624 - rounded = 201.1
9 ......... 254.4696 - rounded = 254.5
10 ....... 314.16 - - - rounded = 314.2
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