if the bisector of the exterior Vertical angle of a triangle is parallel to the base show that the triangle is isosceles
if the bisector of the exterior Vertical angle of a triangle is parallel to the base show that the triangle is isosceles If the bigctor of Ole exterior vertical are a
3.
S 'sosceB.
here angle abc +acb=cad
and dae =eac(bisector)
which means that abc+acb=dae+eac
so abc=dae and eac=acb which also forms alternate angle
if lines are parralele
if the angles of triangles are equal (2 angles)
then it is isoceles