The distance across a circle through the center is called the diameter.

en.wikipedia.org/wiki/Diameter

In geometry, a diameter of a circle is any straight line segment that passes
through the center of the circle and whose endpoints lie on the circle. It can also
be ...

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

Learn the relationship between the radius, diameter, and circumference of a
circle.

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

How to Calculate the Diameter of a Circle. Calculating a circle's diameter is easy
if you know any of the other dimensions of the circle: the radius, the ...

www.mathopenref.com/diameter.html

The diameter of a circle is the length of the line through the center and touching
two points on its edge. In the figure above, drag the orange dots around and see
...

www.mathgoodies.com/lessons/vol2/circumference.html

The distance across a circle through the center is called the diameter. Pi is the
ratio of the circumference of a circle to the diameter. Thus, for any circle, if you ...

www.virtualnerd.com/geometry/circles/tangent-lines/example-circle-radius-diameter

Note: When you know the radius of a circle, you can find the diameter of that
circle with a simple multiplication problem! Follow along with this tutorial to learn
...

www.mathatube.com/geometry-diameter-of-a-circle.html

The diameter of a circle can be foumd by the following formula d = 2r or d = 2 x
radius. Video on how to find the diameter of a circle.

www.ask.com/youtube?q=What Is the Diameter of a Circle?&v=mEqUcfDC5rM

Apr 6, 2011 ... A how to video on How To Determine The Diameter Of A Circle that will improve
your math skills. Learn how to get good at math from ...

www.mathsisfun.com/geometry/circle.html

circle. A circle is easy to make: Draw a curve that is "radius" away from a central
point. And so: ... radius diameter circumference: circle/diameter = pi = 3.14159.