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Understanding Similar Figures in Geometry

Learn how to visually compare geometric figures for similarity, understand proportion in similar figures, and solve for missing sides using proportions and scale factors. Set up Cornell Notes for effective learning.

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Understanding Similar Figures in Geometry

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  1. February 2, 2011 • Write your homework in your agenda: Kuta-software worksheet 2) Set up for Cornell Notes 3) Here’s your Warm-Up…

  2. Similar Figures 5-7 What am I learning today? Similar Figures What will I do to show that I learned it? Understand the meaning of similarity, visually compare geometric figures for similarity, and describe similarity by listing corresponding parts. Course 2

  3. Similar Figures Course 2 5-7 Proportion Reminder: In order for two ratios to form a true proportion, cross products MUST be equal.

  4. Similar Figures Course 2 5-7 Two figures are similar if: 1. Corresponding sides are proportionate. 2. Corresponding sides are dilated by the same scale factor.

  5. Similar Figures Course 2 5-7 Two ways to solve for the missing side. * Use a proportion * Use the scale factor

  6. Similar Figures Course 2 5-7 Using a Proportion: • 1. Write a proportion. The first ratio should be the two corresponding sides you know. The second should be the corresponding sides with one measure missing.

  7. Similar Figures Course 2 5-7 • 2. Solve the proportion using cross products.

  8. Similar Figures Course 2 5-7 Using the Scale Factor: • 1. Find the scale factor by using the equation and two corresponding sides.

  9. Similar Figures Course 2 5-7 • 2. Use the scale factor and equation to find the missing measurement.

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