a straight line that reaches from one point on the edge of a round shape or object, through its centre, to a point on the opposite edge
The diameter o f the tree was about 22 centimeters.
The engineer measured the diameter of the circle to determine its size and proportions.
To find the circumference of the wheel, you need to know its diameter and apply the appropriate formula.
The telescope's primary mirror had a diameter of 10 feet, allowing for detailed observations of celestial bodies.
Students were asked to calculate the diameter of a sphere given its radius as part of their geometry assignment.
