well you can cut the diameter in half (R = D/2.) or you can take the circumference, divide it by pie, and take the square root (R = square root of (C/pi) )
radius = diameter/2
radius = diameter/2.
The formula is 2pie(radius).
The formula for the area of a circle is pi times the radius squared. The formula for the circumference of a circle is two times pi times the radius.
-- Take the formula for the area of the circle in terms of the radius . . . A = (pi) R2-- Solve that formula for 'R'. You'll then have a formula for the radius in terms of the area,which is exactly what you're looking for.
Well the formula for the radius of the square is radius squared * pi (3.14)So find the radius (which is half of the diameter. which is exactly half of the shape)and do the formula. end the answer with "m".
Well to find the radius it is diameter/2.
Radius, "R" = D/2 where D=Diameter.
A radius is a line segment. It has no area.
Diameter = 2*Radius
3.14 times the radius times 2
radius = 1/2 diameter