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Yes you do need to write this.

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Presentation on theme: "Yes you do need to write this."— Presentation transcript:

1 Yes you do need to write this.
Area and Perimeter Yes you do need to write this.

2 AREA The amount of space inside a 2-dimensional object.
Measured in square units cm2, m2, mm2 Not to be confused with……

3 Perimeter The distance around a two dimensional object.
Measured in ‘normal’ units eg. cm, m, mm

4 Some shapes have there own formulas for area
Yes, you do need to draw these as well.

5 Rectangle b a Area of a rectangle = ab (length x width)
Perimeter = 2a + 2b = 2(a + b)

6 No, you don’t have to try one.

7 Parallelogram a b ‘a’ is the vertical height Parallelogram – quadrilateral with two pairs of parallel sides. Area = ab Can not work out the perimeter with the information given.

8 One to try 6cm 7cm Area = 6 x 7 =42 cm2

9 Triangle Area = ½ bh ( ‘h’ is the vertical height)
b b

10 Trapezium (a quadrilateral with one pair of parallel sides)
b Add together the parallel sides, divide by 2 and then multiply by the distance between them. Area = (a + b) x h 2

11 Example 2cm 10cm 5cm Area = (2 + 5) x 10 2 = 3.5 x 10 = 35 cm2

12 Compound Shapes These are shapes made by joining two or more shapes together. To find the area, find the area of the smaller shapes and add together.

13 Example. 7cm 10cm 8cm 3cm 7cm 2cm 8cm 3cm X Y

14 Example. Area of X = 7 x 2 = 14 cm2 Area of Y = 3 x 8 = 24 cm2
Total area = = 38 cm2 7cm 2cm 8cm 3cm X Y

15 Last one. Find the shaded area
10cm Area of square = 10 x 10 = 100 cm2 A. of triangle = ½ x 3 x 4 = 6 cm2 Shaded area = 100 – 6 = 94 cm2 3cm 3cm 4cm

16 The only part left is circles (always a circle question)
And then it’s volume.

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