How to Calculate Diameter With Length & Width Only

How to Calculate Diameter With Length & Width Only
••• mviwa/iStock/GettyImages

Diameter is the length of a line touching two points on a circle that passes through the center. Diameter exists only for circular, or for circle-based objects like a sphere or cylinder, thus the width and length should always be the same. Regardless what information you are given, you can find out the diameter if you have either the radius, circumference or area of the circle.

The diameter is the same as the length or width of any circle. No further calculation is required.

Calculating Diameter From the Radius

The radius is the length from the center of a circle to the edge. Therefore, if you know the radius, multiply it by two to determine the diameter (diameter = 2 x radius).

Calculating Diameter From the Circumference

If you know the circumference, you can divide the circumference by pi and this will be your diameter (diameter = circumference / pi). Pi is approximately rounded to 3.1416.

Calculating Diameter From the Area of a Circle

If you are given the area of a circle, the diameter is equal to the square root of four times the area divided by pi (diameter = √ (4 x area) / pi).

Related Articles

Montessori-Inspired Toys & Kits for Your Little Scientist
How to Calculate a Circular Area
How to Find Radius From Diameter
How to Calculate Volume of a Circular Cylinder
How to Find the Radius of a Circle From a Chord
How to Figure the Cubic Yards in a Circle
How to Calculate the Volume and Circumference of a...
How to Find the Area of a Shaded Part of a Square With...
How to Determine the Diameter of a Circle
How to Find the Radius of a Circle
How to Figure the Diameter of a Circle
How to Calculate the Radius of a Pipe
How to Calculate Circumference in Feet
How to Convert Square Dimensions to Round
How to Find the Radius
Differences Between Circumference & Diameter
How to Trisect a Circle With a Compass
How to Calculate Circumference in Inches
How to Calculate Arc Area
How to Find the Radius of a Sector
How to Solve for the Circumference of a Circle