You can divide the diameter by two.
A = Pi(r)2: A circle with a radius of 8 cm has an area of 201.06 square cm.
2 times pi times radius
Take "pi" times the diameter of the circle. Pi = 3.14159 (ALWAYS) If circle has a diameter of 10cm, circumference 31.41cm If circle has a radius of 2inches, the circumference is 12.57 inches. (radius = 2, diameter = 4)
To find the area of the circle pi*radius*squared and subtract the area of the figure inside
The formula is (pi x radius to the power of 2), so its 3.14 x 82.6= figure it out
The radius of a circle is half of its diameter
When you try to figure out an area of a circle, you square the radius, then multiply it by pi to get the area of a circle. A radius square is radius x radius, or radius squared.
A congruent figure is identical to another figure. Example would be like a circle with the radius of 12 meters, then the congruent figure would have to be a circle with a 12 meter radius.
Pi times the radius of the circle squared = area And diameter is simply the radius x 2, since the radius is half the length of the circle.
The area of any circle = pi*radius2
You take out your ruler and measure it.
pi times radius squared. :)
Figure out the square root
Figure out its radius and multiply it by pi or 3.14.
If the figure is truly a circle, then the circumference is (Radius) x (2 pi) .
you have to double the radius which is the distance from the center of the circle to any other point on the edge of the circle. If you mean the width is the radius then you cant figure it out. you see, the formula is 2(pi)r........r is the radius. you need to know the radius to find the diameter.
The radius of a circle is from the middle to the edge, or half the diameter. The circumference is like the perimeter of the circle, and the formula is pi times the diameter.