Diameter is the distance...

top to bottom.
across a circle.

1 answer

The diameter of a circle is defined as the straight line segment that passes through the center of the circle and connects two points on its circumference. In other words, it is the longest distance across the circle, effectively splitting the circle into two equal halves. The diameter is twice the length of the radius, which is the distance from the center of the circle to any point on its edge.