circumference = pi*41 = 128.805 inches to 3 decimal places
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Circumference = 2*pi*rr(radius) = diameter/2 = 13 in/2 = 6.5 inch radiusCircumference = 2*pi(6.5 inches)= 41 inches in circumference===================
That's 41/2% less than the circumference of the circle.
The square foot area of a 41-foot diameter circle is: 1,320 square feet.
Change the inches into feet and use the area formula for a circle: pi*radius squared
There are: pi*20.52 = 1320.254 square feet to 3 decimal places