What is diameter

Take a circular paper disc, fold it in half and then unfold it. The line of the fold that divides the circle into two halves is a diameter of the circle. In the figure below, XY is a diameter. Trace the outline of a CD, a round plate or a ring on paper and cut it along its edge to get a circular paper disc. Fold the paper disc in another way and you will get another diameter of the circle. Name it ST as below. Measure the lengths of the two diameters.

Any line drawn from the centre O, to the boundary or edge of the circle is a radius of the circle. In the figure above, OP is a radius. Learning Street structured courses make home study easier and more successful. There's no need to wonder which books to buy or what to do next. Everything is planned for you. Home Articles Maths What is the diameter? Articles English 24 Maths Start Learning View Courses. A straight line connecting two opposite points on the surface of a spherical or cylindrical body, or at the boundary of an opening or foramen, passing through the center of such body or opening.

The distance measured along such a line. Published by Houghton Mifflin Company. A straight line segment that passes through the center of a circle or sphere from one side to the other. The length of such a line segment. All rights reserved. The diameter of a circle is a line segment that passes through the center of a circle and has two endpoints at the circumference.

It is twice the length of the radius of a circle, i. The diameter of a circle can be calculated according to the given parameters. If the parameters like radius, circumference, or area are given then we can directly use the following formulas. If you observe the wheel of a cycle, the spikes run from one end to another end through the center. We can relate this to the diameter of a circle, as the diameter is the line segment that starts from one end of a circle and ends at the other end of the circle passing through the center.

If the diameter is given we can find the radius by dividing the value of diameter by 2. The diameter to circumference calculator is an online tool used to determine the value of the circumference of a circle. In the diameter to circumference calculator enter the dimension of the diameter and get the value of circumference within a few seconds.

You can also try the diameter calculator for direct calculations. If the radius of a circle is given in 'r' units then it is easy to determine the diameter of the circle formula. The diameter of a circle is a line segment from one end of the circle to the other end of the circle passing through the center of the circle. Whereas, the radius of a circle is the length of the line segment from the center of a circle to a point on the circumference of the circle. Hence, the radius is half of the diameter of a circle.

The radius of a circle is half the diameter.