Knowing the area of a circle which is pi times radius squared will help you to find other properties of the circle
In order to find the diameter of a circle if you have the area is to rearrange the formula for the area of a circle to put diameter as the unknown, like so: PIE*d = Area of a Circle d = (Area of a Circle) / PIE Therefore if the area of your circle is 40cm, 40/PIE = 12.73cm and that's the diameter.
We know that the area of a circle is pi * r2. We also know that the circumference of a circle is pi * d. Therefore, when you know the circumference of a circle and want to know the area, divide the circumference by pi to give you the diameter of the circle, divide the diameter by 2 to give you the radius, square the radius and then multiply by pi to get the area. So, 10/pi = 3.183. 3.183/2 = 1.5915. 1.59152 = 2.533 2.533 * pi = 7.958 to 3 decimal places. The area of your circle is therefore 7.958cm2.
You know: Area = (pi)r2 So, plug in your known values for the area and pi, then solve for r.
area = pi x r² So, divide the area by pi (3.14159...) and then find the square root.
Area of a circle = pi multiplied by (radius squared)Pi is approximately 3.141 so do r x r x 3.141
0. There is no circle so no shaded area of a circle!
Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)
The area of a circle equals pi times the radius squared (A = pi*radius2) where pi is 3.1416 So the radius is the square root of the area divided by 3.1416
Let us say that you are going to paint a large circle onto the floor of your gymnasium (you are painting not just the circumference, but the whole circle) and you need to find out how much paint you need to buy. You know how many square feet will be covered by a gallon of paint and you therefore need to know the surface area of the circle. There is convenient formula for the area of a circle, which is area equals pi time the radius squared (pi is approximately 3.14). So if you measure the radius of the circle, you can figure out how much paint you need. There are also innumerable other situations in which it is useful to know the radius of a circle.
The Area of a circle is Pi (r)(r) so the area of a circle with the radius of 4, would be 16pi
To find the circumference of a circle when you know the area, you first need to find the radius of the circle using the formula for the area (area = πr^2). Once you have the radius, you can calculate the circumference using the formula for the circumference (circumference = 2πr).
The area of a circle is the amount of space inside the circle. The circumference of a circle is the distance around the outside of the circle. (So no, they are not the same thing.)