en.wikipedia.org/wiki/Plane_(geometry)

In mathematics, a **plane** is a flat, two-dimensional surface that extends infinitely
far. A **plane** is the two-dimensional analogue of a point (zero dimensions), a line
...

www.mathsisfun.com/geometry/plane.html

When we draw something on a flat piece of paper we are drawing on a **plane** ... ...
except that the ... In **geometry** a "**plane**" is a flat surface with no thickness.

study.com/academy/lesson/what-is-a-plane-in-geometry-definition-examples.html

This lesson will help you understand the **geometry** concept of a **plane**. We will
discuss how to name **planes** and look at some example problems. Then,...

www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-intro-euclid/v/specifying-planes-in-three-dimensions

In a three-dimensional space, a **plane** can be defined by three points it contains,
as long as those ... Prepare with these 4 lessons on **Geometry** foundations.

www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-intro-euclid/e/points_lines_and_planes

Practice the relationship between points, lines, and **planes**. For example, given
the drawing of a **plane** and points within 3D space, determine whether the points
...

www.mathplanet.com/education/geometry/points,-lines,-planes-and-angles/an-introduction-to-geometry

A point in **geometry** is a location. It has no size i.e. no width, no length and no
depth. A point is shown by a dot. Point. A line is defined as a line of points that ...

www.mathopenref.com/plane.html

Definition of the **geometric plane**. ... **Plane**. From Latin: plantum - "flat surface,". A
flat surface that is infinitely large and with zero thickness. Clearly, when you ...

virtualnerd.com/geometry/fundamentals/points-lines-planes/plane-definition

Note: You can't learn everything about math without seeing **planes**. Did you know
that there are rules for naming a **plane**? This tutorial introduces you to **planes** ...

www.cliffsnotes.com/study-guides/geometry/fundamental-ideas/points-lines-and-planes

Point, line, and **plane**, together with set, are the undefined terms that provide the
starting place for **geometry**. When we define words, we ordinarily use simpler.