trignometry

Vertex

Definition: The common endpoint of two or more rays or line segments

Vertex typically means a corner or a point where lines meet.


vertex


Angle
Definition: A shape, formed by two lines or rays diverging from a common point (the vertex).

Vertex - The vertex is the common point at which the two lines or rays are joined. Point B is the figure above is the vertex of the angle ∠ABC.

Legs - The legs (sides)of an angle are the two lines that make it up. In the figure above, the lines AB and BC are the legs of the angle ∠ABC.

Interior-The interior of an angle is the space in the 'jaws' of the angle extending out to infinity. See Interior of an Angle

Exterior-All the space on the plane that is not the interior. See Interior of an Angle




FOR STUDY OF TRIGNOMETRY WE HAVE TO STUDY ANGLE SUPPOSE THERE IS ANGLE DENOTED BY A THEN WE CAN SAW






TRIANGLE
A triangle is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments.
IN OTHER WORD A TRIANGLE IS A POLYGON WITH THREE ANGLE.
A triangle with vertices A, B, and C is denoted ABC.