Percent Change of Dimensions Lesson 71. Increase and Decrease ›Increase: Dilation ›Decrease: Reduction ›Creates similar figures; proportional measures.

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Presentation transcript:

Percent Change of Dimensions Lesson 71

Increase and Decrease ›Increase: Dilation ›Decrease: Reduction ›Creates similar figures; proportional measures (radius, side lengths, or diameter) ›Scale factor: ratio of similar measures

Scale Factor: Perimeter, Area, & Volume ›Perimeter: scale factor x perimeter of original (if given) ›Area: scale factor squared x area of original (if given) ›Volume: scale factor cubed x volume of original (if given)

Percent Increase ›Original is always 100% ›Original + increase = new ›Change to a decimal for scale factor (move 2 places left) ›Scale factor: Perimeter: no change, Area: square, Volume: cube ›Change to a percent (move 2 places right) ›Subtract 100%

Percent Decrease ›Original is always 100% ›Original – decrease = new ›Change to a decimal for scale factor (move 2 places left) ›Scale factor: Perimeter: no change, Area: square, Volume: cube ›Change to a percent (move 2 places right) ›Subtract from 100%