Standard position of an angle - trigonometry
In trigonometry an angle is usually drawn in what is called the "standard position" as shown below.
In this position, the
vertex of the angle (B) is on the
of the x and y
axis. One side of the angle
is always fixed along the positive x-axis - that is, going to the right along the axis in the 3 o'clock direction (line BC).
This is called the
initial side of the angle.
The other side of the angle is called the
See also Angle definition and properties - Trigonometry
Other trigonometry topics
Solving trigonometry problems
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