In order to measure the oriented-angle from OA vector towards OB vector, click on icon.
Click on A, O then B.
If the unity angle of the figure is degree, this measure will lie in the range -180 (excluded) to 180.
If the unity angle of the figure is radian, this measure will lie in the range - π (excluded) to π.
The three points clicked must be named.
If they aren't they will be named by the tool.
In future calculus, this measure will be represented by (OA,OB).
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