When you know the circle's radius (r):
pi X r2
When you know the circle's diameter (d):
pi X (d/2)2
Chat with our AI personalities
you take the radius and multiply it by itself. then you multiply the radius squared by 3.14 to get the area of a circle...
To find the area of a circle, you multiply the radius by itself [squared] and then you multiply their product by pi. To find the diameter of circle, you can a)Multiply the radius by two b) Divide the area by pi, find the square root of that product and then multiply it by two.
That would certainly do it.
Area of a circle is: A=π*r2 and r=circumference/2. Find 1/2 of the circumference and square it (multiply by same number), then multiply by pi.
You find the area of a circle with pi times radius squared because the radius is half the circle so to find the full area you need to multiply it again.