What is the difference between diameter and radius

Diameter is the longest line that you can draw in a circle passing through the centre of the circle. Radius is the line joining the centre of the circle to any point on the circumference.

Step-by-step explanation: Diameter is the ratio of the circumference of the circle to the irrational constant 'pi' (3.1415...). Radius is the half of the diameter.

diamiter it the distance bwtween end point of the circle through the midpoint and to another endpoint the radius is from the midpoint to one end point