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Objective : Calculate the area of regular quadrilaterals. o Area is the space inside a 2D shape. o A quadrilateral is a 4 sided shape such as a square.

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Presentation on theme: "Objective : Calculate the area of regular quadrilaterals. o Area is the space inside a 2D shape. o A quadrilateral is a 4 sided shape such as a square."— Presentation transcript:

1 Objective : Calculate the area of regular quadrilaterals. o Area is the space inside a 2D shape. o A quadrilateral is a 4 sided shape such as a square or a rectangle.

2 What is area measured in? Area is measured in SQUARE CENTIMETRES. Area is measured in SQUARE CENTIMETRES. A square centimetre is a square in which all the sides measure 1 cm. A square centimetre is a square in which all the sides measure 1 cm. Area is also measured in SQUARE METRES. Area is also measured in SQUARE METRES. A square metre is a square in which all the sides measure 1 metre. A square metre is a square in which all the sides measure 1 metre.

3 How do we calculate area? Its really easy! Its really easy! Measure the length. Measure the length. Measure the width. Measure the width. Multiply the length X width to calculate the area! Multiply the length X width to calculate the area!

4 Example:- 10 cm 5 cm 10 cm X 5 cm = 50 square centimetres = Area

5 How do we write units of measurement for area? 50 square centimetres would be written as 50cm 2 50 square centimetres would be written as 50cm 2 32 square metres would be written as 32 square metres would be written as 32m 2

6 When do you use sq.cm or sq.m? Which unit of measurement would you use to measure these areas? Which unit of measurement would you use to measure these areas? Area of a floppy disk? Area of a floppy disk? Area of a CD cover? Area of a CD cover? Area of a table? Area of a table? Area of a netball court? Area of a netball court?

7 But what if you want to calculate the area of an irregular shape? What if the shape has more than 4 sides? What if the shape has more than 4 sides? How can you do How can you do Length X Width when there isnt a length and there isnt a width?

8 YOU HAVE TO MAKE RECTANGLES! Look at this shape. How could you calculate the area? Look at this shape. How could you calculate the area? 10cm 6cm 4cm

9 You have to create more than one rectangle. Like this! Like this! 10cm 6cm 4cm A = 6cm X 4cm = 24cm 2 B = 6cm X 4cm = 24cm 2 A + B = Area 24cm cm 2 = 48cm 2 A B

10 So to calculate the area of an irregular shape Split the shape into at least two regular quadrilaterals. Split the shape into at least two regular quadrilaterals. Calculate the area of each one. Calculate the area of each one. Add the two together. Add the two together. Youre done!!!!!!!!!!!!!!!!!!!!!!!!!!! Youre done!!!!!!!!!!!!!!!!!!!!!!!!!!!


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