The maximum straight-line distance between two points on the circumference of a circle.
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Draw a straight line that bisects the circle and passes through the center.
Construct a circle with a compass and then draw a straight line through its centre
A diameter is a line connecting any two points in a circle that passes through the centre of a circle. You can draw 1 diameter and divide the circle in half. You can draw 2 and divide it into 4 pieces or draw an infinite amount and divide it into infinite pieces.
The radius is half the diameter. Draw a line that passes through the centre of the circle and measure it. This is the diameter. Halve it and you will have the radius.
If you draw a line from one side of a circle to the other, and that line hits the center, and goes all the way across, it is the diameter. half of that line going from the center to the edge of the circle is the radius.