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Well, since the formula for the area of a circle is Pi (3.14) times the radius squared, you can use substitution to get an equation that looks like this: 3.14(102) ...which can be simplified to 3.14(100), which can be simplified to come up with the answer of 314 square units.
The diameter of a circle whose circumference is 314 is about 1 (99.95).
3850m is the area of the a circle whose radius of 7meaters
A circle with a radius of 11m has an area of ~380.13 m2
The area of a circle, if the radius is 5 cm, is: 78.54 cm2