To find the area of a circle you must square the radius. In this case the radius is 50 so 50 squared is 2500. 2500 times pi is about 7, 853.98163
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A circle with a radius of 50 feet has an area of pi*502 = 7854.0 sq ft
A circle with a radius of 50 units has a circumference of 314.16 units.
Area = pi*42 = 50.26548246 or about 50 square cm
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared