Wiki User
∙ 6y agoPerhaps the easier way is to re-arrange the standard formula, A = pi.R^2 where A is area, R the radius
So A/pi = R^2
Then R = square-root (A/pi)
Then multiply R by 2 for the Diameter.
HOWEVER
A more direct alternative uses A = pi.R^2 therefore so A = (p/4).D^2 ; and a neat keyboard "trick" that makes this method easy to memorise.
Now, pi/4 = 0.7854, whose digits by happy coincidence live in the top-left corner of the standard (3 x 3) calculator keyboard.
So now D = square-root (A/0.7854)
Wiki User
∙ 6y agopi is a constant = 3.141592654 . . . . circle area = pi * ( ( diameter/2 )2 )
Using the Circumference And Area.
Take out the diameter of the outer circle from the distance between the two. Gives you the diameter of the inner circle then pi r squared it.
Calculate the radius, which is simply 1/2 the diameter. Then use the standard formula for the area of a circle. ________________________________________________________________ The circle area = (pi) x diameter / 4 = 3.14 x 25/4 = 19.625 Sq inch
Use the diameter and divide it by two.
Divide the area by Pi to get the diameter.
pi is a constant = 3.141592654 . . . . circle area = pi * ( ( diameter/2 )2 )
The base of a cone is a circle. The area of a circle is found by multiplying the diameter by Pi.
To calculate this you will need the diameter of the circle. The formula is: diameter/2*pi If you don't know the diameter you can also use the area of the circle: Sqrt(Area/pi) = radius
Using the Circumference And Area.
Area is 4.6 m2
Area= Pi r squared
Take out the diameter of the outer circle from the distance between the two. Gives you the diameter of the inner circle then pi r squared it.
If by "it" you mean a circle, once you know the diameter, you can calculate its radius, its circumference, and its area.
Area is 4.6 m2
Calculate the radius, which is simply 1/2 the diameter. Then use the standard formula for the area of a circle. ________________________________________________________________ The circle area = (pi) x diameter / 4 = 3.14 x 25/4 = 19.625 Sq inch
Use the diameter and divide it by two.