D/2=r
The equation for circumference is C=2(pi)(r) where C is the circumference and r is the radius. You can find the radius by plugging in the circumference into this equation and solving the equation.
The radius of a circle = the diameter of the circle divided by 2
depends on the equation.
The equation for circumference is 2(3.14)(r) or 3.14(d) where r=radius and d=diameter. The radius of a circle is half of the circumference, or the distance across the interior of a circle.
It's radius x radius x pi.
Use the equation for the volume of a cone, replace the known height and volume, and solve the resulting equation for the radius.
Equation of a circle centre the origin is: x2 + y2 = radius2 ⇒ radius = √9 = 3.
the equation for the circumference of a circle is 2*radius*pi, or since the radius is half of the diameter 2*radius=diameter, we can simplify the equation to the circumference of a circle=diameter*pi
the radius squared x pi
2x3.142xr
The radius of the circle decreases when you make the circle smaller.
The equation is: x2+y2 = radius2