ABC is an isosceles triangle in which altitudes BE and CF are drawn to equal sides AC and AB respectively (see Fig. 7.31). Show that these altitudes are equal.
In ∆AEB and ∆AFC,
∠AEB and ∠AFC (Each 90º) A
=∠A (Common angle)
AB = AC (Given)
∠∆AEB ∠∆AFC (By AAS congruence rule)
∴ BE = CF (By CPCT)