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
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