study.com/academy/lesson/what-is-diameter-definition-formula-quiz.html

In this lesson, you can find out how important the **diameter** is to a circle. Also, you
can learn about the **formulas** that were figured out by the...

www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-circumference-circle/a/radius-diameter-circumference

Does not mean anything different just the radius of the circle (**formula**: pi *
**diameter**). **Diameter** is the line that runs through the exact middle of the circle.

www.mathopenref.com/diameter.html

Definition and properties of the **diameter** of a circle. ... Given the radius of a circle,
the **diameter** can be calculated using the **formula**. **Diameter**. = 2. R. where:

www.wikihow.com/Calculate-the-Diameter-of-a-Circle

This goes back to manipulating the **formula** for finding the area of a circle, A = πr^{2}
, to get the **diameter**. You can transform this into r = √(A/π) cm. For example, if ...

www.coolmath.com/reference/circles-geometry

Definitions and **formulas** for the radius of a circle, the **diameter** of a circle, the
circumference (perimeter) of a circle, the area of a circle, the chord of a circle, arc
...

www.math.com/tables/geometry/circles.htm

**Formulas** & Tables · References ... **diameter**: the longest distance from one end of
a circle to the other. ... Circumference of Circle = PI x **diameter** = 2 PI x radius

www.ajdesigner.com/phpcircle/circle_normal_diameter_d.php

Geometry calculator solving for circle **diameter** given radius.

www.mathsisfun.com/geometry/circle.html

radius **diameter** circumference: circle/**diameter** = pi = 3.14159... The Radius is the
distance from the center outwards. The **Diameter** goes straight across the ...

www.mathgoodies.com/lessons/vol2/circumference

Thus, for any circle, if you divide the circumference by the **diameter**, you get a
value close to pi.gif . This relationship is expressed in the following **formula**:.