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© Boardworks Ltd of 42 KS3 Mathematics S5 Coordinates and transformations 2
© Boardworks Ltd of 42 Contents S5 Coordinates and transformations 2 A A A A S5.3 Scale drawing S5.1 Translation S5.2 Enlargement S5.4 Combining transformations
© Boardworks Ltd of 42 Scale drawings We use scale drawings to represent real objects drawn in proportion to their actual sizes. If we are given a scale for a picture then we can work out the size of an object in real life. For example, this is a scale picture of a 10p coin. 0.5 cm in this picture represents 1 mm in real life. The coin in the picture has a diameter of 12.2 cm. What is the actual diameter of the coin? The actual diameter is 24.4 mm.
© Boardworks Ltd of 42 Scale drawings Here is a scale drawing of a car. Every 1 cm in this drawing represents 50 cm in real life. If the length of the car in the drawing is 4.5 cm, what length is the car in real life? Length of the car in real life =4.5 × 50 = 225 cm = 2.25 m
© Boardworks Ltd of 42 Drawing a plan On maps and plans, the scale is usually given as a ratio. For example, Frank decides to draw a plan of his bedroom using a scale of 1 : 20. That means that every 1 cm in the plan represents 20 cm or 0.2 m in real life. He measures his room to find that it has a length of 360 cm and a width of 250 cm. What will the length and the width of the room be in the scale drawing? Length = 360 ÷ 20 =18 cm Length = 250 ÷ 20 =12.5 cm
© Boardworks Ltd of 42 Drawing a plan Frank uses a table to convert between the sizes of the things in his room and their sizes in his plan: ObjectActual sizeSize in the plan Width of door80 cm Bed90 cm by 190 cm Chest of drawers68 cm by 52 cm Wardrobe6 cm by 2.5 cm Desk1.8 cm by 3.2 cm Bookshelf1.75 cm by 3.9 cm 4 cm 4.5 cm by 9.5 cm 3.4 cm by 2.6 cm 120 cm by 50 cm 36 cm by 64 cm 35 cm by 78 cm
© Boardworks Ltd of 42 Maps A map uses a scale of 1 : How many km are represented by 1 cm on the map? 1 cm on the map is cm in real life cm = 400 m= 0.4 km Two towns are 3.5 cm apart on the map. How far apart are they in real life? 3.5 cm × 0.4 =1.4 km 1 cm on the map is 0.4 km in real life.
© Boardworks Ltd of 42 Maps A map uses a scale of 1 : How many km are represented by 1 cm on the map? 1 cm on the map is cm in real life cm = 500 m= 0.5 km Two towns are 2.3 km apart in real life. How far apart are they on the map? 2.3 km ÷ 0.5 =4.6 cm 1 cm on the map is 0.5 km in real life.
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