Radius2 = A/pi
Radius = √(A/pi) (the square root of A/pi)
In other words:
For example: The area is 12.5664 square centimeters.
A (area): A = pi.r.r
D (diameter): d = 2 x R
C (circumference): C = pi x D
Always remember: r (radius), is always half the diameter (D).
So you could simply say r = d/2.
But, what if you only had the C (circumference) to work with?
We say C = 10. Find r
C = pi x D
We know pi = 3.1416.
So, to find r (radius). 10 = pi x D
10 = 3.146 x D
D = 10/3.146
D = 3.179
Since r (radius) is always half of D (Diameter)... We now have D. Go figure ;)
the formula for the area of a circle is 3.14 x radius squared
Well the formula for a full circle is 3.14xradius squared So cut the radius in half then square it the multiple by 3.14
The formula for the area of a circle is πr2, or pi x radius^2 The radius of a circle is the diameter divided by two, and pi is approx. 3.1415926535
πr² is the formula for finding the area of a circle. To find the area of a semicircle just divide the answer by two. So take the radius, square it, which in this case would be 100, multiply it by π [pi (3.14)] and divide it by two.
The area of Circle S can be found by using the area formula for circles. The area of a circle is pi times the radius squared. So, the area of Circle S with a 1 inch radius is Pi inches squared.
Area of circle = pi*(radius)2
Area of a circle = pi*radius squared
Area of a circle = pi*radius2
The area of a circle with a known radius can calculated using the following formula where r is the radius : A = Pi(r)2
The formula to get the area of a circle ("R" being the radius of the circle). Radius means the distance from the center of the circle to the edge.It means pi times radius squared which is the formula for finding the area of a circle.
Using 3.14 as Pi the area of circle is: 1017.36
Pi * R squared, where R is the radius of the circle in question
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
It is the formula for finding the area of a circle which means: pi times radius squared
pi*radius2 is the formula for finding the area of a circle.
It is the formula used in finding the area of a circle which is pi times radius squared
The formula for finding the area of a circle is A= pi r2. Square the radius then multiply it by pi. For your instance, 2.5 squared is 6.25. 6.25 x pi= 19.634... The area of a circle with the radius of 2.5 is 19.634...