This resource has been contributed by Winpossible, and can also be accessed on their website by clicking here - Getting Started - Circles
This mini-lesson introduces and walks you through the basic concepts of the circles. You'll learn it with the help of some examples, practice questions with solution,and using video explanation by the instructor that brings in an element of real-class room experience. You can see here the overview of the important basics of the circle, radius, chord etc.
A circle is the set of points that are equidistant from a special point in the plane. If the special point O
is the center, it is called circle O
. Some real-world examples of a circle are: a wheel, surface of a coin.
The radius is a line segment joining the center of the circle with a point on the circle. If any point A
is on the circle with center O
, then OA
is the radius of circle. If you place two radii end-to-end in a circle, you would have the same length as one diameter. Thus the diameter of a circle is twice as long as the radius, E.g. a circle with 5 cms radius, will have 10 cms diameter.
A chord is a line segment joining two endpoints that lie on a circle. Further you may note that the diameter of a circle is the longest chord since it passes through the center and it can be stated every diameter is a chord, but not every chord is a diameter.
This FREE mini-lesson is a part of Winpossible's online course that covers all topics within Geometry. Click on the video below to go through it. If you like it, you can buy our online course in Geometry by clicking here.