No, I cannot find the word undistinguished in my dictionary. The meaning of the word distinguished as given in the dictionary is specific, distinct. Thus, undistinguished must mean ‘not specific’, ‘not distinct’.
ABC is a triangle in which altitudes BE and CF to sides AC and AB are equal (see Fig). Show that
(i) ∆ ABE ≅ ∆ ACF
(ii) AB = AC, i.e., ABC is an isosceles triangle.

∆ABC is an isosceles triangle in which AB = AC. Side BA is produced to D such that AD = AB (see Fig. 7.34). Show that ∠ BCD is a right angle.

