By Heinemann Educational Publishers

ISBN-10: 0435891502

ISBN-13: 9780435891503

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1 1 Area of the trapezium ϭ ᎏ2ᎏ(a ϩ b)h ϭ ᎏ2ᎏ(5 ϩ 8) ϫ 4 ϭ 26 cm2 The area of the rectangular faces is: (5 ϫ 10 ϩ 5 ϫ 10 ϩ 4 ϫ 10 ϩ 8 ϫ 10) cm2 ϭ 220 cm2 The total surface area ϭ (220 ϩ 26 ϩ 26) cm2 ϭ 272 cm2 2. The area of the base is 5 ϫ 5 cm2 ϭ 25 cm2 1 The triangular faces are identical: 4 ϫ ᎏ2ᎏ (6 ϫ 5) ϭ 60 cm2 Total area is 25 cm2 ϩ 60 cm2 ϭ 85 cm2 Perimeter and area 43 Exercise ᕡ Calculate the surface area of each of the following shapes. a) 10 cm 20 cm 8 cm b) 4 cm 4 cm 4 cm c) 5 cm 4 cm 7 cm 6 cm ᕢ Work out the surface area of each of the shapes below.

Area of parallelogram ϭ base ϫ height ϭ 5 cm ϫ 7 cm ϭ 35 cm2 1 2. Area of trapezium ϭ ᎏ2ᎏ(a ϩ b)h 1 ϭ ᎏ2ᎏ(5cm ϩ 3 cm) ϫ 4 cm 1 ϭ ᎏ2ᎏ(8cm) ϫ 4 cm ϭ 4 cm ϫ 4 cm ϭ 16 cm2 38 Jamaica Maths Connect 3 4 cm 5 cm Exercise ᕡ Calculate the area of each shape. 4 cm 6 cm ᕢ Work out the area of each of these shapes. Copy the shape and show how you divided it up and any dimensions that were calculated. 4 cm and its height is 6 cm. What is the area of the parallelogram? 5 cm. If the perpendicular height of the trapezium is 6 cm, what is the area?

S ϭ D Ϭ T 1 ϭ 180 km Ϭ 1ᎏ2ᎏ hours ϭ 120 km/h Joseph’s speed is 120 km/h. 3. a. 5 km from work. b. It takes him 20 minutes to walk to work. c. Between 6 and 8 minutes the line is horizontal: he doesn’t travel any distance. He could have been waiting to cross a road or stopped to buy a cup of coffee. d. Between 16 and 20 minutes. The slope of the graph is steepest between these times.

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Maths Connect for Jamaica Grade 3 Pupil Book by Heinemann Educational Publishers


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