Triangles - Most Important Questions (Que. 1 to 10) | Class 9 Maths Chapter 7 | CBSE 2024-25
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✅ In this video,
✔️ Class: 9th
✔️ Subject: Maths
✔️ Chapter: Triangles (Chapter 7)
✔️ Topic Name: Most Important Questions (Que. 1 to 10)
✔️ Topics Covered In this video (By Kishore sir): In this captivating video, Sir guides you through the fascinating realm of Class 9 Maths, focusing on 'Most Important Questions (Que. 1 to 10)' of Chapter 7, "Triangles" Sir solves these questions, ensuring you grasp the fundamentals with ease. Join us as we simplify complex topics and make learning fun and engaging for all Class 9 students. Dive deep into the world of Maths as we explore key concepts essential for your studies. =======================================================
00:00 Introduction: Triangles - Most Important Questions (Que. 1 to 10)
01:07 Que. 1 In an isosceles triangle ABC, with AB = AC, the bisectors of ∠B and ∠C intersect each other at 0. Join A to 0. Show that
14:15 Que. 2 ∆ABC is an isosceles triangle in which AB = AC. Side BA is produced to D such that AD = AB (see Fig). Show that ∠BCD is a right angle.
23:05 Que. 3 If the bisector of vertical angle of a triangle bisects the base, prove that the triangle is isosceles.
23:29 Que. 4 ∆ABC and ∆DBC are two isosceles triangles on the same base BC and vertices A and D are on the same side of BC (see figure). If AD is extended to intersect BC at P, show that:
41:14 Que. 5 AD is an altitude of an isosceles triangle ABC in which AB = AC. Show that-
49:49 Que. 6 Two sides AB and BC and median AM of one triangle ABC are respectively equal to sides PQ and QR and median PN of ∆PQR. Show that:
01:00:15 Que. 7 BE and CF are two equal altitudes of a triangle ABC. Using RHS congruence rule, prove that the triangle ABC is isosceles.
01:10:41 Que. 8 Line-segment AB is parallel to another line-segment CD. O is the midpoint of AD (see the adjoining figure). Show that
01:18:55 Que. 9 ABC is an isosceles triangle with AB = AC. Draw AP ⊥ BC to show that ∠B = ∠C.
01:24:45 Que. 10 AB is a line segment and line l is its perpendicular bisector. If a point P lies on l, show that P is equidistant from A and B.
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