Incenter and incircles of a triangle

[northstar1915]

when u draw the angle bisector how do u no where 2 draw the line inside the triangle?

[WarmLittleDiamond90]

Anyone know what the usefulness of this property is in society (i.e. that the three angle bisectors of a triangle intersect at a single point, and that this point is the centre of the incircle of a triangle)? Thanks :-)

[Ch3zin]

Third! :P

[A010795]

Double Angle Formulae next!

[odaymustdie]

First!