What is the diameter?

Is it the distance from side to side passing throught the center of the circle?

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diameter is a line from a point of the circle to another point passing through the center of the circle

The diameter of the circle is the double of it's radius.

D=2r

Diameter is a line that touches any two points in a circle, which must pass through the center of the circle. If you half the diameter, it will be the radius, r of the circle, so it is like saying two times the "r" value, like this: D=2r. It helps you to solve circumference of the circle, the equation being pi*d

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