A circle with a radius of 5 units has an area of 78.54 square units.
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A=pi times R squared If the radius is 5, the area is 25pi
The area of a circle of radius r is pi*r*r
It is 78.5 square units.
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Well, honey, the area of a circle with a 5 km radius is about 78.54 square km. So, if you're looking to throw a party in that space, you've got plenty of room to work with. Just make sure to invite me!