i believe the equation is : 2 x pi x r
so if the radius is half the diameter, it will be 2 x pi x 2.5 = 15.7
2 x pi x r is the circumfrence.. pi x r2= A so 2.52 x pi=6.25pi or about 19.63
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Area of circle = 78.54 sq cm => Radius of circle = 5 cm => Diameter of circle = 10 cm => Side of square = 10cm => Area of square = 100cm2
Area = pi x r2 = 3.142 x 5 x 5 = 78.55 sq cm
cicumference = pi*5 cm area = pi*2.52 square cm
Using 3.14 as Pi the area of circle is: 78.5
Assuming a diameter of 5 inches.The area of this circle is: 19.63