Question

In △ ABC, the bisector AD of ∠ A is perpendicular to side BC (see Fig. 7.27). Show that AB = AC and △ ABC is isosceles.

In an isosceles triangle ABC with AB = AC, D and E are points on BC such that BE = CD (see Fig. 7.29). Show that AD = AE.

In an isosceles triangle ABC, with AB = AC, the bisectors of ∠ B and ∠ C intersect each other at O. Join A to O. Show that: (i) OB = OC (ii) AO bisects ∠ A

In △ ABC, AD is the perpendicular bisector of BC (see Fig. 7.30). Show that △ ABC is an isosceles triangle in which AB = AC.