Area = pi*radius2 So, radius = sqrt(area/pi)
Radius = square root of (area/pi) Circumference = 2*pi*radius
Given a sphere of radius r, Surface area = 4{pi}r2 Volume = (4/3){pi}r3
The area of a circle is A=πr2, so the radius is r = √(A/π). Divide the area by pi and then take the square root.
Half the square root of the square radius equals the circle radius.
Area = pi*radius2 So, radius = sqrt(area/pi)
a=area p=pi r=radius sqr(a/p)=r
Radius = square root of (area/pi) Circumference = 2*pi*radius
Area of a circle = pi x radius squared, so to get the radius, divide the Area by pi (3.14159), and then find the square root of that
Given the radius, r, the area is pi*r^2.If given the diameter d, the radius is d/r so the area is 0.25*pi*d^2If given the circumference, c, the radius is c/(2*pi), so area = 0.25*(c^2)/pi
Divide 314 by pi and square root the answer which will give you the radius.
A = pi x radius squared where pi = 3.14
If yo have the area of the circle, the square is irrelevant. Radius = sqrt(Area/pi)
The answer depends on what information you are given.
By using the other information supplied about the circle to calculate either its radius (from which its area can be calculated) or its area (if the circle is similar to another with a given area and some ratio between the two circle is given):If the diameter is given: radius = diameter ÷ 2If the circumference is given: radius = circumference ÷ 2πIf the circle is similar to another circle which has a given area, and the length ratio is given; square the length ratio to get the area ratio and apply to the given area.
A = pi x radius2
Given a sphere of radius r, Surface area = 4{pi}r2 Volume = (4/3){pi}r3