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Level 4/5 Booster Lesson 9B Area and Perimeter

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**dimensions square units Objectives:**

Deduce and use formula for the perimeter and area of a rectangle. Calculate the perimeter and area of shapes made from rectangles. Vocabulary: dimensions square units

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**The area of this rectangle is 12 cm².**

What are the possible dimensions – length and width of this rectangle? Which of the rectangles you have found has the largest perimeter? Possible answers 1 x 12 cm 2 x 6 cm 3 x 4 cm (any other answers would involve lengths with decimals). Largest perimeter x 12 cm rectangle with a perimeter of 26cm. Even greater perimeters are achieved if decimal lengths are acceptable!!! ( Example x 120cm perimeter is 240.2cm.)

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**This rectangle has a perimeter of 12 cm.**

Find as many different rectangles with a perimeter of 12cm. Which of the rectangles has the largest area? Possible answers: 4 x 2 cm, 3 x 3 cm, 1 x 5 cm Any other answers would include decimal lengths. Largest area: 3 x 3 cm = 9cm²

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**- + 8cm 6cm 3cm 5cm Work out the area and perimeter of the shape. 8cm**

B Area is: + Perimeter: cm 8cm 6cm Area is: - Perimeter: Why? 3cm

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**Find the area and perimeter of each of the shapes below: (all measurements given in cms)**

9 W/S 9.1B 8 3 3 8 5 4 4 3 2 7 4 10 5 5 2 4 7

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Answers: 9 8 3 A = 40 cm² P = 30 cm 3 8 5 A = 47 cm² P = 34 cm 4 4 3 2 A = 75 cm² P = 38 cm A = 32 cm² P = 32 cm 7 4 10 5 5 2 4 7

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W/S 9.2B 15m 10m 3m Calculate the area shaded green. Working: (15 x 10) – (3 x 3) = 150 – 9 = 141m² 60cm 40cm 10cm Calculate the area of the blue cross. Working: (10 x 60) + (10 x 40) – (10 x 10) = 900cm²

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**dimensions square units Objectives:**

Deduce and use formula for the perimeter and area of a rectangle. Calculate the perimeter and area of shapes made from rectangles. Vocabulary: dimensions square units

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**Thank you for your attention**

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