Euclid's Elements - Book III, Proposition 9
If from a point inside a circle three or more congruent line segments can be drawn between the point and the circle at one time, then the point is the center of the circle.
Angle bisection by means of a perpendicular to the side of a
KERUCUT DALAM TABUNG
Vector Field 3D
Exploration 1 - Proportionallity with Angle Bisector