Area of a circle: A = πr2. This formula reads, “Area equals pi are squared.”. Find the radius, circumference, and area of a circle if its diameter is equal to 10 feet in length. If the diameter ( d) is equal to 10, you write this value as d = 10. The radius is half the diameter, so the radius is 5 feet, or r = 5.

What is Pi? (π explained) - YouTube Dec 16, 2011 term:circumference circle = pi(diameter) or 2(pi)(radius The distance across a circle through its center. Half of the diameter. Circle Java Program to find Volume and Surface Area of Sphere Volume = (4.0 / 3) * PI * radius * radius * radius Volume = (4.0 / 3) * 3.14 * 5 * 5 * 5 Volume = 452.39. Let us calculate the Radius of a Sphere using the Surface Area: In the above example, we got the Surface area of a Sphere = 452 when the radius = 6. Let us make the reverse approach (Calculating the radius from the Surface area).

## Google Answers: Mathmatical formula for finding the

Circumference Of A Circle Calculator - Pi Day If you know the diameter or radius of a circle, you can work out the circumference. To begin with, remember that pi is an irrational number written with the symbol π. π is roughly equal to 3.14. The formula for working out the circumference of a circle is: Circumference of circle = π x Diameter of circle. This is typically written as C = πd. This tells us that the circumference of the circle is three “and a bit” … Circles - math Diameter = 2 x radius of circle. Circumference of Circle = PI x diameter = 2 PI x radius where PI = = 3.141592 Area of Circle: area = PI r 2. Length of a Circular Arc: (with central angle ) if the angle is in degrees, then length = x (PI/180) x r if the angle is in radians, then length = r x

### Where Pi (π) is of course the number and r is the radius of the circle. Where does this formula come from? One method of obtaining this equation is to integrate dxdy over the area of a circle.

Jun 13, 2017 Does anyone know how to find radius of convergence for sin Mar 22, 2010 How can the area of a semicircle with diameter of 14