Simple instructions to find the diameter of a circle using the standard formula.
These instructions are written in a simple format to explain how to find the diameter of a circle.
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 d is the diameter and r is the radius.
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?