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Published byMagdalene Sullivan Modified over 6 years ago

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Essential UnderstandingEssential Understanding You can use ratios to compare the perimeters and areas of similar figures Students will be able to find the perimeters and areas of similar figures

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Perimeters and Areas of Similar Figures If the scale factor of two similar figures is a/b, then The ratio of their perimeters is a/b The ratio of their areas is a 2 /b 2

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Finding RatiosFinding Ratios Two similar polygons have corresponding sides in the ratio 5:7 What is the ratio (larger to smaller) of their perimeters? What is the ratio (larger to smaller) of their areas?

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Finding AreaFinding Area The scale factor of two similar parallelograms is ¾. The area of the larger parallelogram is 96 in 2. What is the area of the smaller parallelogram?

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Finding AreaFinding Area The area of the smaller regular hexagon is about 127.3 ft 2. What is the best approximation for the area of the larger regular hexagon?

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Applying AreaApplying Area The scale factor of the dimensions of two similar pieces of window glass is 3:5. The smaller piece costs $2.50. How much should the larger piece cost?

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Applying AreaApplying Area

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Finding PerimeterFinding Perimeter The areas of two similar rectangles are 1875 ft 2 and 135 ft 2. What is the ratio of their perimeters?

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Perimeter

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Homework Pg. 638 # 9 – 18, 20 – 28 even, 46 16 problems

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