Mathematical literacy Topic :Perimeter and Area

Introduction

Perimeter: Is the length of the outline of a shape. To find the perimeter of a rectangle or square you have to add the lengths of all the four sides. Measuring units are always written in mm, cm, m. For perimeter your answer is always in unit form

Circumference: The perimeter of a cycle or the distance around curved edge of a circle. The area answer is in unit2(mm2; cm2; m2;)

Area: The amount of space inside a flat 2-dimentional object

We do perimeter and Area where they can be very helpful in everyday life context. We make use of calculations of area and perimeter quiet often in a variety of contexts, and use these calculations to make many decisions. We often need to make use of area and perimeter calculations to determine the cost of a project or buildings.

Task

In everyday life perimeter and area are used constantly for example, for describing the size of a house by talking about its floor area, or for working out how much wire is needed to fence off a field. Sometimes we used these measurements in our homes or schools whereby you will find that when you want to buy windows, doors, cupboard and so on you will firstly need to measure the lengths or height in order to get area or perimeter of a certain object that you want to buy. The leaners will have to complete a task of how to calculate the area using their own object which has a shape of rectangle, square or circle using correct measurements units which are( mm ,cm ,m.) or ( mm2,cm2,m2).

 

Process

1. A learner has to draw draw three shapes which are rectangle, square and circle.

2. A leaner has to write down lengths, width, radius, diameter.

3. They have to calculate the area and perimeter using the given measurements units on shapes and use given formula.

4. Learner need to analyze the garden plan in order to calculate the the length, and area of a garden.

5. A learner need to calculate the circumference of a given circle. 

6. Measure the effect of changing one dimension (length or width) of a rectangle on its perimeter.

Evaluation

1. Drawing of shape correctly [1x3] 3 marks

2. Writing correct formula to calculate area and perimeter. [1x3] 3 marks.

2. Calculates the effect of changing one dimension (length or width) of a rectangle on its perimeter and area [ 3x3] 6 marks.

3. Able to analyze garden plan and calculate length and Area of a garden [ 2x4] 8 marks.

4. A leaner is able to calculate the circumference of a circle [ 2x2] 4 marks.

                                                                                                                              TOTAL: 24 MARKS

Conclusion

You need to understand the difference between perimeter and area and when to perform which calculation. Picking up a correct formula can help you calculate the given question. You need to make sure that you follow each and every steps when using the formula in order for you to get a correct answer and not get confused. When calculating perimeter and area make sure that you write correct measurements units in your answer.

Credits

Teacher Page

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