# 3.6 To investigate how to determine area

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1.1 5 × 7 = 35

1.2 1 × b = opp.

## Content

Have you ever had new tiles or carpets laid in your house? What do you have to know about a room to be able to have something like this done?

## Activity: to investigate how to determine area [lo 4.8.2]

1. This is the floor plan of the Vissers’ kitchen. Mrs Visser wants to lay new tiles. The tiles are each 1 m wide and 1 m long.

1.1 How many tiles do you need to cover the floor?

_____________________________________________________________________

1.2 How did you calculate this? Can you explain this in one or two clear number sentences?

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

REMEMBER:

You multiply the length of the one side with the length of the other one.

The unit is then expressed to the power of 2 (m2).

You have just calculated the area of Mrs Visser’s kitchen floor.

1.3 Can you perhaps write down a formula for calculating the area of such a regular shape?

Area of a rectangle: ____________________________________________________

## Assessment

Learning Outcome 4: The learner will be able to use appropriate measuring units, instruments and formulae in a variety of contexts.

Assessment Standard 4.8: We know this when the learner investigates and approximates (alone and/or as a member of a group or team):

4.8.2: area of polygons (using square grids) in order to develop rules for calculating the area of squares and rectangles.

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