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In geometry, formal definitions are developed using other characterized words or terms. Over there are, however, three words in geometry that room not official defined. These words room point, line and plane, and also are referred to as the "three undefined terms of geometry".

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While this words space "undefined" in the official sense, we deserve to still "describe" these words. The descriptions, proclaimed below, refer to these indigenous in relation to geometry.

POINT • a suggest indicates a place (or position) in space. • a allude has no dimension (actual size). • a point has no length, no width, and no elevation (thickness). • a point is usually named with a resources letter. • in the name: coordinates plane, a point is named by an notified pair, (x,y). while we stand for a point with a dot, the dot have the right to be really tiny or an extremely large. Remember, a allude has no size.
The dimension of the dot drawn to stand for a point makes no difference. Points have actually no size. They just represent a location.
LINE (straight line) • a line has no thickness. • a line"s length extends in one dimension. • a line goes ~ above forever in both directions. • a line has infinite length, zero width, and also zero height. • a line is suspect to be straight. • a heat is attracted with arrowhead on both ends. • a line is called by a solitary lowercase script letter, or by any two (or more) points which lie ~ above the line.
Lines have the right to be labeled v a solitary script letter, or by two points ~ above the line,
. The thickness the a line makes no difference.

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PLANE • a airplane has two dimensions. • a aircraft forms a flat surface expanding indefinitely in all directions. • a airplane has infinite length, boundless width and zero elevation (thickness). • a aircraft is attracted as a four-sided figure resembling a tabletop or a parallelogram. • a airplane is called by a single letter (plane m) or by three coplanar, however non-collinear,* clues (plane ABC).
aircraft m or aircraft ABC. If the chart of a plane has edges, you have to remember that the plane actually has no boundaries.
* upright points space points that lie on the same straight line. Coplanar points space points that line in the very same plane.

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