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

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Presentation on theme: "Objectives: Vocabulary: Deduce and use formula for the perimeter and area of a rectangle. Calculate the perimeter and area of shapes made from rectangles."— Presentation transcript:

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3 Objectives: Vocabulary: Deduce and use formula for the perimeter and area of a rectangle. Calculate the perimeter and area of shapes made from rectangles.

4 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 answers1 x 12 cm2 x 6 cm3 x 4 cm (any other answers would involve lengths with decimals). Largest perimeter 1 x 12 cm rectangle with a perimeter of 26cm. Even greater perimeters are achieved if decimal lengths are acceptable!!! ( Example 0.1 x 120cm perimeter is 240.2cm.)

5 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

6 8cm 6cm 3cm 5cm Work out the area and perimeter of the shape. 8cm 6cm 3cm 5cm A B Area is:A + B Perimeter: cm 8cm 6cm Area is: - Perimeter:Why? 3cm

7 Find the area and perimeter of each of the shapes below: (all measurements given in cms) W/S 9.1B

8 Answers: A = 47 cm² P = 34 cm A = 40 cm² P = 30 cm A = 32 cm² P = 32 cm A = 75 cm² P = 38 cm

9 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 W/S 9.2B

10 Objectives: Vocabulary: Deduce and use formula for the perimeter and area of a rectangle. Calculate the perimeter and area of shapes made from rectangles.

11 Thank you for your attention


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