PlanTrigonometry
Angles in a circumference
To represent angles in a circumference:
- we take the O (0,0) point as vertex
- we use the radius on the positive semiaxis of abscissas as origin
- we draw the extreme of the angle by measuring it:
- counterclockwise, if it is positive
- clockwise, if it is negative
If the radius is 1, we call it goniometric circumference.
We have four quadrants:
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