When the radius is r and the center is at (a,b), the formula is (r*cos(θ) + a , r*sin(θ) +b). When the circle is rooted at (0,0), the formula is simply (r*cos(θ) , r*sin(θ)). This is the polar-coordinates system.
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To calculate the area of a circle use this formula: pi x r2.
Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
A circle is two dimensional, it has area but not volume.
A simple formula to calculate the circumference of a circle: so in this case:
To calculate the are of a circle, use the formula area = pi x radius2.