4. In Δ ABC, BC = AB and ∠B = 80°. Then ∠A is equal to 4. In Δ ABC BC = AB and ∠B = 80°. Then ∠A is equal to June 30, 2021 Category: Chapter 7 - Triangles , Maths , NCERT Class 9 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related 3. In Δ ABC, AB = AC and ∠B = 50°. Then ∠C is equal to3. Two sides AB and BC and median AM of one triangle ABC are respectively equal to sides PQ and QR and median PN of ΔPQR (see Fig. 7.40). Show that: (i) ΔABM =~ ΔPQN (ii) ΔABC =~ ΔPQR4. ABC is a triangle in which altitudes BE and CF to sides AC and AB are equal (see Fig. 7.32). Show that (i) ΔABE ΔACF (ii) AB = AC, i.e., ABC is an isosceles triangle.
