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Published byWendy James Modified over 8 years ago

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No Warm-Ups This Week We will have a test Monday over formulas and area.

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Geometry 9-5 Effects of Changing Dimensions Proportionally

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Big Idea When the dimensions of a figure are changed, the perimeter and area of the figure change proportionally. To find out how they change, substitute values into the formulas.

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Example A rectangle has length, l=4, and width, w=12. What is the effect on the area of the rectangle if… The length is tripled? The width is doubled? The length is tripled and width is doubled?

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Example Name four different ways the dimensions could change to achieve the following result: –The area of a parallelogram is increased by a factor of 12.

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Example Describe the effects of quadrupling the radius of a circle to the: –Circumference –Area

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