Skip to main content

AREA OF CIRCLE LESSON NOTE AND LESSON PLAN FOR PRIMARY AND SECONDARY SCHOOLS AND HIGH SCHOOLS




Days
W.A..L.T: 
Content 
Starter 
Class activities
Plenary 
Homework 

Monday 
Meaning of circle and  parts of a circle

Resources 
a cardboard with circle drawn on it  

A circle is a perfect round plane. 

Examples of circle are; coins, wheels, rings, tin tops and bottom of buckets.

Parts of a Circle.
Centre: the point at the middle of the circle.

Circumference: is the curved outer edge of the circle. (the distance round the circle ). It is the longest part of a circle.

Diameter: the line from a side through the centre to another side. It divides the circle to equal halves. Half of a diameter is a radius.

Radius: is any straight line drawn from the centre to the circumference.

Semi-circle: half of a circle.

Quadrant : is a quarter part of a circle.

Chord: a straight line joining two points on the circumference. ( a chord does not divide a circle into equal halves like the diameter)

Sector: is a region between two radii and the circumference.

Begin the lesson by drawing a circle on the board and asking them what shape it is.


Pupils should be able to mention at least 4 parts of a circle then give explanation on them. 


Tuesday
Finding the Area of circle 
 
The area of a circle is found by using the formula πr² ,  where π is pi with value as 22/ 7  or 3.142 and where r is the radius of the circle. 

Example: 
1. Find the area of the circle with radius 7cm. Take π a 22/7
Solution 
Area = πr² = π  X r X r
                   = ( 22/7 X 7 X 7 ) cm²
                                 = 154cm²
2. Find the area of a circle of diameter 7cm. Take pi as 22/7 
solution 
radius is half of a diameter 7/2cm = 3  cm 
                area = πr² = π X r X r
            = (   22/7 X  3.5  X  3. 5) cm²
                 = 38.5 cm²

Start the lesson by stating the formula for finding the area of the circle

Pupils should be able  to calculate the area of the shaded portion of the shape given



Wednesday
Finding the radius of a circle. 

If you are required to find the radius of a circle when the area and pi are given, the rule is ; change the formula for finding the area.
Area = πr²  ( divide both sides by  π )
     A = πr²          
      
   Radius  =   (A/π)¹/² (square root both sides) 

Example : find the radius of a circle whose area is 154 cm2 . takes π as 22/7
Radius =   (A/π)¹/²
 Radius =  (154/3.142)¹/²
             
             = 7cm²

Begin the lesson by doing the first example for them.

Pupils should be able to calculate the area of the given shape correctly.


Thursday 
Finding the area of semi- circle

Example :  find the area of the semi - circle with radius 7cm.Take π as 22/7.

Solution :
Area of semi- circle =  πr²/2   
= (   22/7 X 7  X 7  )/2 cm²
                        =19.25 cm²

Begin the lesson by doing the first example for them.

Pupils should be able to calculate the area of the given shape correctly.


Comments

Related Posts Plugin for WordPress, Blogger...

Popular posts from this blog

7 Ultimate Exercises That Will Transform Your Body

Looking for some effective ways to transform your body? There are a few great exercises that will help you to reach your fitness goal. These exercises are easy but effective in strengthening your body along with burning unwanted calories. However, sticking to these exercises is not enough to transform your body, you should also eat healthy and get enough sleep regularly. Don’t waste your precious time doing other workouts, here are seven exercises that will help you transform your body in no time. 1. Jumping rope When was the last time you jumped rope? Perhaps in your childhood. Jumping rope is a cheap and easily portable exercise that you can do almost anywhere. This workout burns more calories per minute than any other workout. Get jumping for a perfect exercise and plenty of fun. One of the best things about jumping rope is that you can do it with your kids. Moreover, jumping rope is a fantastic way to fit in a highly effective cardio session when you are on the go. Simply tos

DO YOU SEE THESE STRANGE LINES ON YOUR NAILS? DON'T JOKE WITH IT, THIS IS WHAT IT SAYS OF YOUR HEALTH

As I’ve gotten older, those vertical ridges on my nails seem to be getting more and more prominent. That’s when I decided to do some research to see if those ridges meant anything about my health, and if there was anything I could do to get rid of them. What They Mean About Your Health After a lot of research, I did find that there is a small, rare possibility that those ridges can mean an underlying medical condition or possibly even nail trauma. But for most of us, it’s completely normal as we age to see them getting more noticeable, especially if you have dry skin or skin conditions such as eczema. I’m 36, and they’ve only recently started bothering me, but I’m relieved to find that they are most likely harmless. I’m just getting old. But Why Are They There? They’re basically like wrinkles of the nails! As we age, the nail matrix gradually starts to lose it’s effectiveness in some areas, causing your nails to grow out uneven, resulting in what we see as lines or ridges that run from

JUMIA PICK UP CENTERS IN LAGOS

So I ordered for a product on Jumia, and the challenge came when I tried to locate where to pickup my product. Eventually I got it by asking Okada and Marwa riders. In this article I try to write the accurate addresses and description of Jumia pick up centers in lagos. Agege Pick up Center Station 10, Agege Motor Road, Mangoro, Lagos Description  The building beside Total Filling Station. As if you are going to ikeja along but you will stop before Elizade blue roof. Locate the Total fuel station and ask for Jumia office.  Ikoyi Pick-Up Station 20, Eleshin Street Obalende Off Saint Gregory’s College Road 08:00am – 5.00pm (Monday to Friday) 08099817140 Ilupeju Pick-Up Station 14, Olowogbowo Street, Off Obokun street, Off Coker Road AMVILLE SCHOOL 08:00am – 5.00pm (Monday to Friday) Saturday: 10am-3pm 070332296785,08023833440 ACME Pick-Up Station, Ikeja 1B, Surulere Industrial Road, Off Adeniyi Jones Rd, Off Acme Road, Ikeja By Universal Bus-stop 08:00am – 5.00pm (Monday to Friday) 081721