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.

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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
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