# The point where two sides of an angle meet

### What is the intersection of the two sides of an angle called? | Socratic

It's called vertex. An angle is formed when two rays meet at a common endpoint, or vertex. The two sides of the angle are the rays, and the point that unites them is called the. In plane geometry, an angle is the figure formed by two rays, called the sides of the angle, . When two straight lines intersect at a point, four angles are formed.

### The common endpoint of the sides of an angle? | cypenv.info

For any two points, only one line passes through both points. On the other hand, an unlimited number of lines pass through any single point. Ray[ edit ] We construct a ray similarly to the way we constructed a line, but we extend the line segment beyond only one of the original two points. A ray extends indefinitely in one direction, but ends at a single point in the other direction.

That point is called the end-point of the ray. Note that a line segment has two end-points, a ray one, and a line none. An angle can be formed when two rays meet at a common point.

The rays are the sides of the angle. The point of the end of two rays is called the vertex. Plane[ edit ] A point exists in zero dimensions. A line exists in one dimension, and we specify a line with two points.

A plane exists in two dimensions. We specify a plane with three points. Any two of the points specify a line.

Given two sides and an angle determine whether one, two or no triangle. Part 1

All possible lines that pass through the third point and any point in the line make up a plane. In more obvious language, a plane is a flat surface that extends indefinitely in its two dimensions, length and width.

## What is the intersection of the two sides of an angle called?

A plane has no height. With positive angles representing rotations toward the positive y-axis and negative angles representing rotations toward the negative y-axis.

When Cartesian coordinates are represented by standard position, defined by the x-axis rightward and the y-axis upward, positive rotations are anticlockwise and negative rotations are clockwise. In three-dimensional geometry, "clockwise" and "anticlockwise" have no absolute meaning, so the direction of positive and negative angles must be defined relative to some reference, which is typically a vector passing through the angle's vertex and perpendicular to the plane in which the rays of the angle lie.

In navigationbearings or azimuth are measured relative to north.

• Geometry/Points, Lines, Line Segments and Rays
• Vertex (geometry)
• The common endpoint of the sides of an angle?

Alternative ways of measuring the size of an angle[ edit ] There are several alternatives to measuring the size of an angle by the angle of rotation. The grade of a slopeor gradient is equal to the tangent of the angle, or sometimes rarely the sine.

A gradient is often expressed as a percentage.

In rational geometry the spread between two lines is defined as the square of the sine of the angle between the lines. As the sine of an angle and the sine of its supplementary angle are the same, any angle of rotation that maps one of the lines into the other leads to the same value for the spread between the lines.

Astronomers measure angular separation of objects in degrees from their point of observation.

These measurements clearly depend on the individual subject, and the above should be treated as rough rule of thumb approximations only.

Angles between curves[ edit ] The angle between the two curves at P is defined as the angle between the tangents A and B at P. The angle between a line and a curve mixed angle or between two intersecting curves curvilinear angle is defined to be the angle between the tangents at the point of intersection.