Length of Angle Bisector of Isosceles Triangle is the measure of the length of the line which bisects the Isosceles Triangle, at the apex angle, into two congruent triangles. And is denoted by lAngle Bisector. Length of Angle Bisector of Isosceles Triangle is usually measured using the Meter for Length. Note that the value of Length of Angle Bisector of Isosceles Triangle is always positive.