Geometry 10-4 Perimeters of Areas of Similar Figures
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by Matthew Richardson
| 24 Questions
Note from the author:
A complete formative lesson with embedded slideshow, mini lecture screencasts, checks for understanding, practice items, mixed review, and reflection. I create these assignments to supplement each lesson of Pearson's Common Core Edition Algebra 1, Algebra 2, and Geometry courses. See also mathquest.net and twitter.com/mathquestEDU.
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Solve It! Complete the tables on the canvas using the text tool.
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Solve It! How do the ratios of the perimeters and the ratios of the areas compare with the scale factors? The outlined content above was added from outside of Formative. 3
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Problem 1 Got It?
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Problem 1 Got It?
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Problem 2 Got It?
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Problem 3 Got It? The scale factor of the dimensions of two small pieces of window glass is 3 : 5. The smaller piece costs \$2.50. How much should the larger piece cost?

Enter your answer in this format: \$2.71 7
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Problem 3 Got It? Reasoning: In Problem 3, why is it important that each dimension is 2.5 times the corresponding dimension of the original plot? Explain.
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Problem 4 Got It?
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Reasoning: The area of one rectangle is twice the area of a similar rectangle. What is the ratio of their perimeters? How do you know?
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Error Analysis: Your friend says that since the ratio of the perimeters of two polygons is ½, the area of the smaller polygon must be one half the area of the larger polygon. What is wrong with this statement? Explain.
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Compare and Contrast: How is the relationship between the areas of two congruent figures different from the relationship between the areas of two similar figures? 17
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Review Lesson 10-3: Match each regular polygon with its area.
• 480 square units
• 690 square units
• 484 square units
• a square with apothem 11
• a regular pentagon with apothem 13.8 and side length 20
• an octagon with apothem 12 and side length 10 18
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Review Lesson 10-3: Fill in the blank. Enter only a number. The area of the regular polygon is __?__ square inches. 20
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Vocabulary Review: Categorize each statement based on whether it is always, sometimes, or never true.
• Corresponding angles of similar figures are congruent.
• Corresponding sides of similar figures are proportional.
• Always
• Sometimes
• Never
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Vocabulary Review: Identify the pairs of similar figures. Select all that apply.  22
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Use Your Vocabulary: Which segment is NOT a radius of regular pentagon ABCDE?

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Use Your Vocabulary: Complete each sentence with are or are not.
• are
• are not
• The radii of a regular polygon __?__ congruent.
• The triangles formed by the radii and sides of regular pentagon ABCD __?__ congruent.
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Reflection: Math Success
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