# Interactive video lesson plan for: Parallelogram Theorem 5:Proving a quadrilateral is a square

#### Activity overview:

Parallelogram Theorem 5:Proving a quadrilateral is a square
http://www.learncbse.in/ncert-solutions-for-class-9-maths/
In this video we will learn how a quadrilateral is a square, provided diagonals of a quadrilateral are equal and bisect each other.

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

00:02 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.
01:09 consider two triangles and find similarity between triangles.
01:28 Proof
01:35 Consider two triangles and test them for similarity
05:40 Use property of Rhombus:The diagonals of a rhombus bisect each other at right angles (90°)
08:29 Apply parallel lines theorem:The sum of co-interior angles is 180
09:42 Aplly properties of Square

learncbse.in
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
characteristics of a parallelogram
Proving a parallelogram is a rectangle.

Tagged under: GyanPub,ncert solutions,Free Online Maths Class,Maths,Free ncert solutions,Proving parallelogram rectangle.,parallelogram properties geometry,Quadrilaterals Properties Parallelograms,Proving Quadrilateral Parallelogram (Lesson),Proving Quadrilateral Parallelogram,CBSE class 9 maths NCERT Solutions chapter 10 Quadrilaterals,NCERT solutions CBSE class 9 maths Quadrilaterals

Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.

Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip

Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans

Play this activity

1. Students enter a simple code

2. You play the video

3. The students comment

4. You review and reflect

* Whiteboard required for teacher-paced activities

## Ready to see what elsecan do?

With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.

Quickfire

Carry out a quickfire formative assessment to see what the whole class is thinking

Discuss

Create interactive presentations to spark creativity in class

Team Up

Student teams can create and share collaborative presentations from linked devices

Clip

Turn any public video into a live chat with questions and quizzes

### Spiral Reviews by Teachers and Digital Learning Coaches

@kklaster

Tried out the canvas response option on @SpiralEducation & it's so awesome! Add text or drawings AND annotate an image! #R10tech

Using @SpiralEducation in class for math review. Student approved! Thumbs up! Thanks.

@ordmiss

Absolutely amazing collaboration from year 10 today. 100% engagement and constant smiles from all #lovetsla #spiral

@strykerstennis

Students show better Interpersonal Writing skills than Speaking via @SpiralEducation Great #data #langchat folks!