A precise location or place on a plane. Usually represented by a dot.
Move the points P or Q around with the mouse. Point R is not draggable.
A point is an exact position or location on a plane surface. It is important to understand that a point is not
a thing, but a place.
We indicate the position of a point by placing a dot with a pencil. This dot may have a diameter of, say, 0.2mm, but a point has no size.
No matter how far you zoomed in, it would still have
no width. Since a point is a place, not a thing, it has no dimensions.
Points are usually named by using an upper-case single letter. In the figure above, the points P,Q and R are shown.
In this web site, points are shown either as a black dot or with a somewhat larger orange halo. This indicates the point can be dragged with a mouse.
To drag a point:
- Move the mouse over a point with an orange halo until a + or a hand symbol appears.
- Press and hold the mouse button.
- With the button down, move the mouse. The point will move.
- Release the mouse button.
In another branch of mathematics called coordinate geometry, points are located on the plane using their
coordinates - two numbers that show where the point is positioned with respect to two number line "axes" at right angles to each other.
For more on this, see
While you are here..
... I have a small favor to ask. Over the years we have used advertising to support the site so it can remain free for everyone.
However, advertising revenue is falling and I have always hated the ads. So, would you go to Patreon and become a patron of the site?
When we reach the goal I will remove all advertising from the site.
It only takes a minute and any amount would be greatly appreciated.
Thank you for considering it! – John Page
Become a patron of the site at patreon.com/mathopenref
Other point topics
(C) 2011 Copyright Math Open Reference. All rights reserved