If the median to the base of a triangle is perpendicular to the base, then triangle is isosceles.

If the straight line which bisects the vertical angle of a triangle is perpendicular to the base, the triangle is:

If the median drawn on the base of a triangle is half its base, the triangle will be:

Prove the following by vector method. Median to the base of an isosceles triangle is perpendicular to the base.

If the bisector of the exterior vertical angle of a triangle be parallel to the base.Show that the triangle is isosceles.

If the bisector of the exterior vertical angle of a triangle be parallel to the base.Show that the triangle is isosceles.

If the bisector of the exterior vertical angle of a triangle be parrallel to the base, show that the triangle is isosceles.

If the bisector of the exterior vertical angle of a triangle be parallel to the base. Show that the triangle is isosceles.

If the bisector of the exterior vertical angle of a triangle be parallel to the base. Show that the triangle is isosceles.