
Point
A precise location or place on a plane. Usually represented by a dot.
Try this
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 uppercase 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.
Dragging hints
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.
Coordinate Geometry
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
Related topics
(C) 2009 Copyright Math Open Reference. All rights reserved

