AngleBisector

AngleBisector[{q1, p, q2}] gives the bisector of the interior angle at p formed by the triangle with vertex points p, q1 and q2.

AngleBisector[{q1, p, q2}, "type"] gives the angle bisector of the specified type.

Examples

Find the angle bisector of a triangle:

AngleBisector[{{0, 0}, {1, 0}, {0, 1}}]

Visualize with graphics:

Graphics[{Triangle[{{0, 0}, {2, 0}, {1, 2}}], Red, AngleBisector[{{2, 0}, {0, 0}, {1, 2}}]}]

Please visit the official Wolfram Language Reference for more details.