quadrilaterals-properties-of-parallelogram-parallelogram-theorems-proof

Quadrilaterals | Properties of Parallelogram | Parallelogram Theorems Proof

http://www.learncbse.in/ncert-solutions-for-class-9-maths/

A quadrilateral has four sides, four angles and four vertices.

In this chapter, we will study more about different types of quadrilaterals, their properties and especially those of parallelograms.

In this video, we learn how to apply Congruency Rule to solve Problems on Qudrilaterals. Use parallel lines concept and triangle congruence theorems to prove/solve problems on properties of parallelograms.

Reference book for the above video is

National Council of Educational Research and Training (NCERT) Book for Class 9 Subject: Maths

This Video is also refers as CBSE Class 9 mathts NCERT Solutions Chapter 8 Quadrilaterals

Q2-00:02 Q3-04:46 Q4-10:43 Q5-20:10

00:02 CBSE class 9 maths NCERT Solutions chapter 10 Quadrilaterals q2. If the diagonals of a parallelogram are equal, then show that it is a rectangle.

01:05 Proof

01:54 Apply SSS congruency Rule

03:13 Apply properties of parallel lines.

04:10 Rectangle

04:46 CBSE class 9 maths NCERT Solutions chapter 10 Quadrilaterals q3. Show that if the diagonals of a quadrilateral bisect each other at right angles, then it is a rhombus.

05:56 Proof

07:21 Apply SAS congruency rule

08:45 Use SAS congruency rule

10:19 Apply Properties of Parallelogram

10:43 CBSE class 9 maths NCERT Solutions chapter 10 Quadrilaterals q4. Show that the diagonals of a square are equal and bisect each other at right angles.

13:17 Use SAS congruency rule

14:21 Use of rule Vertically opposite angles are equal.

14:55 Use parallel lines property:Alternate interior angles are equal

17:15 Apply CPCT

20:10 CBSE class 9 maths NCERT Solutions chapter 10 Quadrilaterals Q5. Show that if the diagonals of a quadrilateral are equal and bisect each other at right angles, then it is a square.

21:40 Consider two triangles and find similarity between triangles.

24:59 Aplly property of Rhombus

26:08 Use property of Rhombus:The diagonals of a rhombus bisect each other at right angles (90°)

28:39 Apply parallel lines theorem:The sum of co-interior angles is 180

29:50 Aplly properties of Square

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CBSE solutions for class 9 maths Quadrilaterals

CBSE class 9 maths chapter 10 Quadrilaterals

CBSE class 9 maths NCERT Solutions chapter 10 Quadrilaterals

Solutions for CBSE Class 9 Maths Chapter 10

NCERT solutions for class 9 maths Quadrilaterals

NCERT solutions for CBSE class 9 maths Quadrilaterals

CBSE Class 9 maths solutions Quadrilaterals

Tags

properties of parallelograms

parallelogram properties geometry

parallelogram geometry

solve quadrilaterals

Determining if a Quadrilateral is a Parallelogram

parallel lines and triangle congruence theorems

Parallelogram Theorems Proof using Properties of Parallelogram

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