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Lesson 18: Computing Actual Lengths from a Scale Drawing

Lesson 18: Computing Actual Lengths from a Scale Drawing. Objective

catherine-dudley
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Lesson 18: Computing Actual Lengths from a Scale Drawing

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  1. Lesson 18: Computing Actual Lengths from a Scale Drawing Objective • Given a scale drawing, students compute the lengths in the actual picture using the scale. Students identify the scale factor in order to make intuitive comparisons of size then devise a strategy for efficiently finding actual lengths using the scale.

  2. Vocabulary • Scale: The ratio of the length in a drawing (or model) to the length of the real thing. • Scale Factor: The ratio of the length in a drawing to the length of the real thing, but having a common unit or label.

  3. Example1: Basketball at Recess?

  4. Example 2: The Garden

  5. Example 3: Tablet

  6. Example 4: Performance at the Mall Students from the high school are going to perform one of the acts from their upcoming musical at the atrium in the mall. The students want to bring some of the set with them so that the audience can get a better feel of the whole production. The backdrop that they want to bring has panels that measure 10 feet by 10 feet. The students are not sure if they will be able to fit these panels through the entrance of the mall since the panels need to be transported flat (horizontal). They obtain a copy of the mall floor plan, shown below, from the city planning office. Use this diagram to decide if the panels will fit through the entrance. Use a ruler to measure.

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