The equation for circumference is C = 2*pi*r, where r is the radius of the circle and pi is a constant = 3.14159...
Assuming that you mean a 9cm radius, the circumference is therefore:
C = 2*pi*r = 2*pi*9cm = 18cm*pi = ~56.549cm
17.905 square units.
2*pi*radius or pi*diameter
Approx 2011 acres.
56.549 cm
Divide the circumference by 2*pi which then will give you the radius and use pi*radius2 to find the area of the circle
A circle with a radius of 4.5Cm has an area of 63.62Cm2
56.549 cm
If circ is 8pi the radius must be 4 so area is 16pi
Divide the arc's degree measure by 360°, then multiply by the circumference of the circle.
It is 28.3 cm, approx.
254.47 square cm
The circumference of a circle that is 9 cm wide is: 28.274 cm