High School Math based on the topics required for the Regents Exam conducted by NYSED.

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Point, Line and Plane:

In Geometry, we have several fundamental concepts: point, line and plane. From these three basic terms, all other terms in Geometry can be defined.

In Geometry, we define a point as a location and no size. A line is defined as something that extends infinitely in either direction but has no width and is one dimensional while a plane extends infinitely in two dimensions.

A point is an exact location in space. They are shown as dots in a plane in 2-dimensions or dots in space in 3-dimensions. It is labeled with capital letters. It does not take up any space.

A line is a geometric figure that consists of an infinite number of points lined up straight that extends in both directions forever. A line is identified by a lower case letter or by two points that the line passes through. We can draw exactly one line through two points. All points on the same line are called collinear. Two lines are either parallel or they will intersect at a point. A line segment is part of a line with two end points.

A ray starts from one end point and extends in one direction forvever.

A plane is a flat 2-dimensional surface. It can be identified by 3 points in the plane. There are infinite number of lines in a plane. The intersection of two planes is a line. Coplanar points are all in one plane.

This video explains and demonstrates the fundamental concepts (undefined terms) of geometry: point, line, plane.

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