Get 2008 IN PI-R2

The area of a circle is: (Pi) times the Radius squared:A = r2. or, when you know the Diameter:A = ( /4) × D2. or, when you know the Circumference:A = C2 / 4

They are : C = 2*pi*R A = pi*R*R where "*" stands for multiplication. Since R*R is sometimes called "R squared", often this equation for area is said "pi R squared". In summary, pi is a number, but it is used in equations. -

Pi r squared In basic mathematics, pi is used to find the area and circumference of a circle. Pi is used to find area by multiplying the radius squared times pi. So, in trying to find the area of a circle with a radius of 3 centimeters, 32 = 28.27 cm.

To find the area of a circle with the radius, square the radius, or multiply it by itself. Then, multiply the squared radius by pi, or 3.14, to get the area.

0:33 2:46 Suggested clip Area of a circle, how to get the formula. - YouTubeYouTubeStart of suggested clipEnd of suggested clip Area of a circle, how to get the formula. - YouTube

The height becomes equal to the radius, while the length is half of the circumference (C = 2 R) which now finds itself running along the top and bottom. As the number of triangles approaches infinity the circle can be taken apart and rearranged to fit almost perfectly into an R by R box with an area of R2.

Pi is the ratio of a circle's circumference to its diameter. ... So, for any circle, dividing its circumference by its diameter will give you the exact same number: 3.14159 or pi. Pi is also an irrational number, which means that its value cannot be expressed exactly as a simple fraction.

Pi ( ) is the ratio of the circumference of a circle to its diameter. It doesn't matter how big or small the circle is - the ratio stays the same. ... Because it's so easily observed (you can measure it with a piece of string!), Pi has been popular for centuries.

It was not until the 18th century about two millennia after the significance of the number 3.14 was first calculated by Archimedes that the name pi was first used to denote the number. ... He used it because the Greek letter Pi corresponds with the letter 'P' and pi is about the perimeter of the circle.

The number known as pi ( ) has fascinated people for millenia. The digits to the right of its decimal point can keep going forever, and there is absolutely no pattern to these digits. ... = 3.

Well, 2*pi*r and pi*2 are basically the same thing. And both are valid. And you already know that the ratio of the Circumference of the circle and it's Diameter of the circle equals pi. And the exact value of pi is 3.14.

The usual definition of pi is the ratio of the circumference of a circle to its diameter, so that the circumference of a circle is pi times the diameter, or 2 pi times the radius. ... This give a geometric justification that the area of a circle really is "pi r squared".

By definition, pi is the ratio of the circumference of a circle to its diameter. In other words, pi equals the circumference divided by the diameter ( = c/d). Conversely, the circumference of a circle is equal to pi times the diameter (c = d).

The area of a circle is: (Pi) times the Radius squared:A = r2. or, when you know the Diameter:A = ( /4) × D2. or, when you know the Circumference:A = C2 / 4

The circumference of a circle can be found by multiplying pi ( = 3.14 ) by the diameter of the circle. If a circle has a diameter of 4, its circumference is 3.14*4=12.56. If you know the radius, the diameter is twice as large.