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Objective : Calculate the area of rectangles.

Objective : Calculate the area of rectangles. Area is the space inside a 2D shape. Squares and oblongs are both rectangles. 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.

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Objective : Calculate the area of rectangles.

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  1. Objective : Calculate the area of rectangles. Area is the space inside a 2D shape. Squares and oblongs are both rectangles.

  2. 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.

  3. How do we calculate area? • It’s really easy! • Measure the length. • Measure the width. • 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 50cm2 • 32 square metres would be written as 32m2

  6. When do you use cm2 or m2? • 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?

  7. 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?

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

  9. 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

  10. So to calculate the area of an irregular shape • Split the shape into at least two rectangles. • Calculate the area of each one. • Add the two together. • You’re done!

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