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Objective : Calculate the area of rectangles. - PowerPoint PPT Presentation


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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

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
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.
how do we calculate area
How do we calculate area?
  • It’s really easy!
  • Measure the length.
  • Measure the width.
  • Multiply the length X width to calculate the area!
example
Example:-

10 cm

5 cm

10 cm X 5 cm = 50 square centimetres = Area

how do we write units of measurement for area
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

when do you use cm 2 or m 2
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?
but what if you want to calculate the area of an irregular shape
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?

you have to make rectangles
YOU HAVE TO MAKE RECTANGLES!
  • Look at this shape. How could you calculate the area?

6cm

6cm

4cm

10cm

you have to create more than one rectangle
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

so to calculate the area of an irregular shape
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!