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Area and Perimeter Yes you do need to write this.
AREA The amount of space inside a 2-dimensional object. Measured in square units cm 2, m 2, mm 2 Not to be confused with……
Perimeter The distance around a two dimensional object. Measured in normal units eg. cm, m, mm
Some shapes have there own formulas for area Yes, you do need to draw these as well.
Rectangle b a Area of a rectangle = ab (length x width) Perimeter = 2a + 2b = 2(a + b)
No, you dont have to try one.
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.
One to try 6cm 7cm Area = 6 x 7 =42 cm 2
Triangle Area = ½ bh ( h is the vertical height) h b b
Trapezium (a quadrilateral with one pair of parallel sides) a h b Add together the parallel sides, divide by 2 and then multiply by the distance between them. Area = (a + b) x h 2
Example 2cm 10cm 5cm Area = (2 + 5) x 10 2 = 3.5 x 10 = 35 cm 2
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.
Example. 7cm 10cm 8cm 3cm 7cm 2cm 8cm 3cm X Y
Example. Area of X = 7 x 2 = 14 cm 2 Area of Y = 3 x 8 = 24 cm 2 Total area = = 38 cm 2 7cm 2cm 8cm 3cm X Y
Last one. Find the shaded area 10cm Area of square = 10 x 10 = 100 cm 2 A. of triangle = ½ x 3 x 4 = 6 cm 2 Shaded area = 100 – 6 = 94 cm 2 3cm 4cm
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