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The distance from the center of the circle to any point on the outside of of the circle is called the radius, and we use the letter r to define it.
If a circle has a radius of 1m, every point on the circle will be 1m from the center. If a circle has a radius of 5cm, every point on the circle will be 5cm from the center.
The length of a straight line going from one point on the circle, through the center, to the opposite side of the circle is called the diameter, and we use the letter d to define it.
Because the diameter runs from one point to the center and then all the way to the opposite point on the circle, it is twice as long as the radius. Thus d=2r.
If the line doesn't pass through the center of the circle or it isn't straight, then it's not the diameter.
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