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scale drawing in gen math 11 lesson week 7

Use a scale to interpret and compare distances on maps, blueprints, and sketches.

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Understandin g Scale Drawings
Aim • Understand the term scale drawing. • Interpret scale drawings into actual measures. • Interpret actual measures into scale drawings.
Scale Drawings A scale drawing is a drawing of an object that has to use different measures on the drawing. For example: A wall may have real-life measurements of 5m × 8m. However, there is no way you could draw these actual measurements on paper. For this reason, we use scale drawings.
Scale Drawings So, because 5m × 8m is too big to draw on paper, we change these measurements into scaled measurements. Instead of using metres, we change it to a smaller measure: 1m : 1cm Now, we are able to draw our wall (5cm × 8cm) and know that every cm we draw, represents one metre in real life.
Interpreting Scale Drawings into Actual Measurements Look at the building. This building has been ‘drawn to scale’. 1cm : 1m What are the actual measurements of this building? 7cm 14cm That’s right, 7m wide and 14m high! Show Answers Hide Answers
Interpreting Scale Drawings into Actual Measurements Look at the building. This building has been ‘drawn to scale’. 1cm : 3m What are the actual measurements of this building? 4cm 15cm That’s right, 12m wide and 45m high! Show Answers Hide Answers
Interpreting Actual Measures into Scale Drawings Sometimes, we need to convert actual measurements into scaled measurements. Look at the building. This building shows it’s actual measurements. 5m : 1cm What are the scaled measurements of this building? 60m 40m That’s right, 12cm wide and 8cm high! Show Answers Hide Answers
Interpreting Actual Measures into Scale Drawings Look at the building. This building shows its actual measurements. 4m : 1cm What are the scaled measurements of this building? 88m 32m That’s right, 22cm wide and 8cm high! Show Answers Hide Answers
Who Uses Scale Drawings? architects builders/plumbers/electrician/joiners structural engineers surveyors machinists interior designers
How to Find Scale,actual distance and distance on map? Dm Ad S Information: Dm = Distance on Map Ad =Actual Distnce S = a scale S = Dm : AD Ad = Dm : S Dm = Ad x S