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Calculating Perimeter and Area of Shapes - Helpful Strategies and Units of Measurement

Learn how to find the perimeter of shapes using various strategies like adding side lengths or doubling measurements. Discover ways to calculate the area of compound shapes with different rectangles.

gregorytyler
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Calculating Perimeter and Area of Shapes - Helpful Strategies and Units of Measurement

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  1. Q. What do we mean by finding the perimeter of a shape? Q. What strategies might you use for calculating the perimeter of a rectangle?

  2. You could... – add together the lengths of the sides; – double the length, double the breadth and then adding these two answers together; – add together one length and one breadth and then double this answer.

  3. 1 5.5m 3 2 3cm 4.5m 25cm 1 cm 4 5 12 cm 19 mm 89 m Obviously they are not to scale!  9mm 41 m

  4. Q Do you have to measure all the sides of a rectangle? Q What units of measurement might you use?

  5. This is called a COMPOUND SHAPE because it is made up of different rectangles.

  6. 10 - 7 = 3cm 15 – 10 = 5cm

  7. 15 + 10 + 5 + 3 +10 + 7 =

  8. This is called a COMPOUND SHAPE because it is made up of different rectangles.

  9. Q How do we work out the area of a shape? Length x width = area

  10. 1cm² What is the area of the shape?

  11. 1 5m 3 2 3cm 4m 12cm 2 cm 4 5 3 cm 10 mm 8 m Obviously they are not to scale!  9mm 4 m

  12. So what is the area of this compound shape? 16cm 10cm 10cm 8cm

  13. So what is the area of this compound shape?

  14. SATS Challenge 4 cm What is the area of this shape? 2 marks 10 cm 7 cm 10 cm

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