Question

open - ended
what is the diameter of a circle?

Explanation:

Step1: Define diameter

The diameter is a straight line passing through the center of a circle.

Step2: Relationship with radius

It connects two points on the circle's circumference. Its length is twice the radius, \(d = 2r\).

Answer:

The diameter of a circle is a straight line passing through the center of the circle, connecting two points on its circumference, and its length is twice the radius (\(d = 2r\)).