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Published byEthelbert Richard Modified over 8 years ago

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PERIMETER

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Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14

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Example 3cm 6cm 5cm 3+6+5 P = 14 5cm 2cm 5cm 2+2+5+5 P = 14

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Now…You!!

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Area of rectangles Area is the space inside a 2D shape.

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How do we calculate area? Measure the length. Measure the width. Multiply the length X width to calculate the area!

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Area of Squares Side 3cm 3 cm. Side A square has all sides the same length. Therefore, we do not need a length and a width. We can simply call them sides. The area of a square can be calculated by multiplying side by side…or side squared.

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Area of a square is given by: A = a 2 where a = length of side

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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? 10cm 6cm 4cm

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

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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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Great job!

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