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Published byLuke Harrison Modified over 4 years ago

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**Objective : Calculate the area of regular quadrilaterals.**

Area is the space inside a 2D shape. A quadrilateral is a 4 sided shape such as a square or a rectangle.

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**What is area measured in?**

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

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**How do we calculate area?**

It’s really easy! Measure the length. Measure the width. Multiply the length X width to calculate the area!

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**10 cm X 5 cm = 50 square centimetres = Area**

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

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**How do we write units of measurement for area?**

50 square centimetres would be written as 50cm2 32 square metres would be written as 32m2

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**When do you use sq.cm or sq.m?**

Which unit of measurement would you use to measure these areas? Area of a floppy disk? Area of a CD cover? Area of a table? Area of a netball court?

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**But what if you want to calculate the area of an irregular shape?**

What if the shape has more than 4 sides? How can you do Length X Width when there isn’t a length and there isn’t a width?

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**YOU HAVE TO MAKE RECTANGLES!**

Look at this shape. How could you calculate the area? 6cm 6cm 4cm 10cm

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**You have to create more than one rectangle.**

A = 6cm X 4cm = 24cm2 B = 6cm X 4cm = 24cm2 A + B = Area 24cm2 + 24cm2 = 48cm2 Like this! 4cm 6cm A 6cm B 4cm 10cm

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**So to calculate the area of an irregular shape**

Split the shape into at least two regular quadrilaterals. Calculate the area of each one. Add the two together. You’re done!!!!!!!!!!!!!!!!!!!!!!!!!!!

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