Question

What is D in circles?

Answer 1

In the context of circles, D typically refers to the diameter of the circle.

The diameter is the straight line that passes through the center of the circle and touches both ends of the circle's boundary (the circumference). It is the longest possible distance between any two points on the circle.

You can calculate the diameter if you know the radius (r) of the circle:

\[
D = 2r
\]

Where:

1. \(D\) is the diameter.
   

1. \(r\) is the radius of the circle (the distance from the center to the edge).
   

So, if you have the radius, simply multiply it by 2 to find the diameter.