NCERT Class 9 Quadrilaterals Examples 1 to 7 | Full Chapter Revision | Math Mentor
Автор: MissMuse
Загружено: 2026-03-11
Просмотров: 12
Описание:
Don't ignore the examples! 🟦 In this video, your Math Mentor breaks down Examples 1 through 6 from the Class 9 Maths Quadrilaterals chapter.
Many students find the proofs in Example 2 (Rectangle) and Example 4 (Parallel lines) difficult to visualize. I’ve simplified the logic, showing you exactly which theorems to apply and how to use CPCT to finish your proofs in record time. Perfect for your final exam revision!
Key Concepts Covered:
Proving a parallelogram is a rectangle.
Working with parallel lines and bisectors.
Logic behind the Mid-point theorem applications.
Timestamps (NCERT Examples):
00:00 - introduction
00:36 - Example 1: Show that each angle of a rectangle is a right angle
03:48 - Example 2: Show that diagonals of a rhombus are perpendicular
07:49 - Example 3: ABC is an isosceles triangle (Proving AD || BC)
12:13 - Example 4: Two parallel lines l and m intersected by a transversal
17:35 - Example 6: The "Mid-point" Application Example (Very Important!)
22:00 - Example 7: l,m and n are three parallel lines
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#Class9Maths #QuadrilateralsClass9 #NCERTExamples #MathMentor #GeometryProofs #Class9Revision
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