## Simple instructions to find the diameter of a circle using the standard formula.

**d=2r**

These instructions are written in a simple format to explain how to find the diameter of a circle.

## Instructions

The diameter of a circle is 2 x the radius and is basically the span of two radii across the circle’s center point thus forming a horizontal line across the entire circle like the example shows. The formula is expressed as: * d=2r*, where

*is the diameter and*

**d***is the radius.*

**r**For example, if * r=4*, then you multiply 4 by 2. In this case, the diameter would be 6.

**d=8**## Simple rules to remember:

*You always multiply the radius x 2 to get the diameter of a circle.*

*You can divide the diameter by 2 to get the radius of a circle if the diameter is known.*

**All posts in this series:** What is a circle? | What is the radius of a circle? | What is the diameter of a circle? | What is the circumference of a circle? | What is the area of a rectangle? | What is the perimeter of a triangle? | What is the area of a triangle?