The formula for area of a circle is
A=pi*r2
where A=area, and r=radius of circle
the radius is half the diameter (D=2r), so A = pi*2.52= 19.63 (to 2 decimal places)
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Assuming a diameter of 5 inches.The area of this circle is: 19.63
19.63 square inches are in the area of a 5-inch diameter circle.
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diameter= 5m radius= diameter/2 = 5/2 =2.5m area of the circle= πr*r =22/7*2.5*2.5 =19.64....m
Alike: Their in the formula to find the area of the circle pie times radius squared or pie times diameter divided by 2 Different: In a circle, radius is half of the diameter. Example: If the diameter of a circle is 10. Then the radius would be 5.