lesson 1 Quadrilaterals

lesson 1 Quadrilaterals

May 02, 2020

QUADRILATERALS 

LESSON 1

4th May

Few Instructions 

Welcome you all once again!

1. Note down  the work in your register on a regular basis..

2 AS ALREADY MENTIONED,YOU CAN USE ANY NOTEBOOK AVAILABLE AND SUBMIT SEPARATELY ONCE THE SCHOOL REOPENS.

3. Take your  Mathematics Register

4. Write chapters name  QUADRILATERALS and todays date 

Guidelines for the Blog

·         The text in BLUE, is to be written in your register

·         The text in Red is to be viewed by clicking on it

·         The text in green is to be practiced for home work

·         Feel free to clarify your doubts by dropping a comment before going ahead in the lesson

Todays learning  outcomes  

I will be able to recall 

• simple closed curve 
• polygon and its types 
• evaluate number of diagonals 

What is  Curve ?

 “Curve” is a line which is not straight. In simple terms, it can be any line which is somewhat bent.  A curve needs to be continuous and smooth.

Types of Curves

Let us now try to understand the different types of curves which have varying definitions and properties.

so  click the given link   simple and closed curve 

Simple Curve

As we know, a curve is a line that is not straight. Hence, Simple Curve can be termed as a curve that doesn’t cross itself.

Closed Curve

A curve in which the starting point and ending point match is known as a closed curve. Such type of curves creates a path which may start from any point and conclude at the same point. 
NOTE , a closed curve doesn’t necessarily have to be a curve. For example, a square is a form of a closed curve. 

Simple Closed Curve

A simple closed curve is a connected curve which doesn’t cross itself and concludes at the same point from which it began. For example circles, polygons ,etc.

  Draw and name  (cw)

Lets  TRY TO UNDERSTAND Ex 3.1 Q1 (a,b )   Do it in register (HW)

what is a polygon ? click the given link polygon

 POLYGON

Define polygon in your own words ? (cw)

Polygons can be ?click  👇 write the definitions 

                                         
 convex and  concave polygons

Lets solve  these questions which are given below  (CW)

As  you have understood convex and concave polygons so

 Q1 (c,d,e ) (hw)
check answers, after  doing your HW

Classification of Polygons

Polygons are classified as per their sides or vertices they have.

To know more about it ,click 👇

                                                                  
tTTyTTypes of polygon

Have you seen the video  ?  

Now  draw and  write   name of  the  three  polygons which are not labelled ?👆 (CW)

The table  given above will help you to name the polygon  

polygon having  10 sides      DECAGON 

WE KNOW 

polygon having  3 sides   is ...........   (Triangle/ quadrilateral )

polygon having 4 sides is.....(HEXAGON /QUADRILATERAL)

Each polygon can be further  classified into  two types:- (write both the definitions with examples,  in your register)

 Now lets solve Q2 of Ex.3.1  (CW) 

WE CAN ALSO CALCULATE 'diagonals' BY USING THE FORMULA

 Number of diagonals of a polygon   =  n (n-3)  / 2  , 
where n = number of sides of polygon

Q2 (b)    
  hexagon  n = 6

 No. of diagonals =   n (n-3)  / 2 
                            = 6 ( 6 - 3 ) /2
                             =  6 x 3 /2 
                              =18 / 2
                               = 9

Try   Q2 (a,c) by using formula   

HOME WORK Q5

Question:-   Identify these  

THATS ALL FOR TODAY

 HAVE A GOOD DAY   😂

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