area-of-the-triangle-is-half-the-area-of-the-parallelogram-word-problems-cbse-class-9-maths

Area of the triangle is half the area of the parallelogram | Word Problems | CBSE class 9 maths

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

All these solutions are based on geomentry,properties of triangles and intended to use Parallelogram Theorems.Students can learn to solve problems on Areas of Parallelograms and Triangles.

In this chapter, we will study more about Parallelogram Theorems based on Areas of Parallelograms and Triangles, their properties and especially those of Areas of Parallelograms.

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

00:02 CBSE class 9 maths Areas of Parallelograms and Triangles Q1. In Fig. 9.15, ABCD is a parallelogram, AE perpendicular DC and CF perpendicular AD.If AB = 16 cm, AE = 8 cm and CF = 10 cm, find AD.

00:37 Use properties of parallelogram:In a parallelogram, pair of opposite sides are equal & Opposite angels are equal.

01:26 Apply Area of Parallelogram Formula:Area of a parallelogram is the product of its base and the corresponding altitude.

02:00 Find Area of a parallelogram with base CD

02:40 Find Area of a parallelogram with base AD

03:28 CBSE class 9 maths Areas of Parallelograms and Triangles Q6.A farmer was having a field in the form of a parallelogram PQRS. She took any point A on RS and joined it to points P and Q. In how many parts the fields is divided? What are the shapes of these parts? The farmer wants to sow wheat and pulses in equal portions of the field separately. How should she do it?.

04:07 Construction to solve the given Word Problem

05:05 Apply Parallelogram Theorem: If a parallelogram and a triangle are on the same base and between the same parallels, then area of the triangle is half the area of the parallelogram.

05:23 Apply AREA Axoim:If a planar region formed by a figure T is made up of two non-overlapping planar regions formed by figures P and Q, then ar (T) = ar (P) + ar (Q), where ar (X) denotes the area of figure X.

07:33 CBSE class 9 maths Areas of Parallelograms and Triangles Q2. If E,F,G and H are respectively the mid-points of the sides of a parallelogram ABCD, show thatar (EFGH) = 1/2 ar (ABCD) .

08:22 Construction Procedure to solve the given Word Problem

08:33 Use properties of parallelogram:In a parallelogram, pair of opposite sides are equal & Opposite angels are equal.

09:40 Apply Parallelogram Theorem: If a parallelogram and a triangle are on the same base and between the same parallels, then area of the triangle is half the area of the parallelogram.

11:46 Adding the obtained results.

13:05 CBSE class 9 maths Areas of Parallelograms and Triangles Q3. P and Q are any two points lying on the sides DC and AD respectively of a parallelogram ABCD. Show that ar (APB) = ar (BQC).

13:50 Construction Procedure to solve the given Word Problem

14:55 Apply Area of Triangle Formula:Area of a triangle is half the product of its base and the corresponding altitude.

16:47 CBSE class 9 maths Areas of Parallelograms and Triangles Q4. In Fig. 9.16, P is a point in the interior of a parallelogram ABCD. Show that

(i) ar (APB) + ar (PCD) = 1/2 ar (ABCD) (ii) ar (APD) + ar (PBC) = ar (APB) + ar (PCD) [ Hint : Through P, draw a line parallel to AB.]

17:32 Construction

18:29 Apply Parallelogram Theorem:If a parallelogram and a triangle are on the same base and between the same parallels, then area of the triangle is half the area of the parallelogram

21:36 (ii) ar (APD) + ar (PBC) = ar (APB) + ar (PCD)

23:31 use Parallelogram Theorem

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 9 Areas of Parallelograms and Triangles

This video is suited for CBSE class 9 maths Areas of Parallelograms and Triangles.

Follow us on Google Plus:

https://plus.google.com/+phanicbse

Like us on Facebook:

https://www.facebook.com/ncertsolutionsbooks

Follow us on twitter

https://www.twitter.com/gyanpub

learncbse.in

CBSE solutions for class 9 maths Areas of Parallelograms and Triangles

CBSE Class 9 maths solutions Areas of Parallelograms and Triangles

areas of parallelograms and triangles CBSE class 9 exercise 9.3

Lesson on areas of parallelograms and triangles CBSE CLASS 9

Areas of Parallelograms and Triangles (Lesson)

Tagged under: GyanPub,ncert solutions,Free Online Maths Class,Maths,Free ncert solutions,CBSE Class 9 maths solutions Areas Parallelograms Triangles,CBSE class 9 maths NCERT Solutions chapter 10 Areas Parallelograms Triangles,Triangles,Review Area Parallelograms Triangles,areas parallelograms triangles CBSE class 9 exercise 9.3,Lesson areas parallelograms triangles CBSE CLASS 9,Areas Parallelograms Triangles (Lesson)

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

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

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

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.

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

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

Dr Ayla Göl
@iladylayla

A good tool for supporting active #learning.

The Team Up app is unlike anything I have ever seen. You left NOTHING out! So impressed!