The area of a circle is equal to pi*r2, where pi is the radius. In this case, the area is equal to pi*(7 feet)2, which is about 154 square feet.
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Oh, dude, you just take the radius, which is 7 feet, square it (49), multiply it by pi (approximately 3.14), and voila, you get an area of about 153.86 square feet. Like, who even needs to know that, right?
Area of any circle = pi*radius squared
The area is 154 cm2
Using 3.14 as Pi the area of circle is: 7.0649999999999995
Using 3.14 as Pi the area of circle is: 153.86