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Scale Factors Similar figures have the same shape, but not necessarily the same size. They are proportional. Scale Factor Scale Factor A scale factor greater than 1 causes the object to get bigger (scaling up) A scale factor is a number that relates the two ratios in a proportion. A scale factor less than 1 causes the object to get smaller (scaling down) It is the number multiplied by or divided by to turn one ratio into the other. Find the scale factor from the solid figure to the dashed line figure: Take the second figure's measurement and divide it by the first figure's measurement. 4 4 8 Scale Factor: 18 6 Identifying the Scale Factor To identify the scale factor, write a ratio (fraction) using one of the dimensions. Simplify. Scale Factor: Scale Factor: 48 24 Actual Size: 66 in Find the scale factor from the solid figure to the dashed line figure: 16 actual length model length What about the scale factor for height? Will it be the same? Scale Factor: actual height model height 132 in Model: 5.5 in It tells how much larger or smaller the image or object is 11 in Scale Factors Using the Scale Factor Leonardo da Vinci's painting Mona Lisa has dimensions 77 cm by 1 is used to make a small poster. Using 53 cm. A scale factor of 5 the scale factor, find the size of the poster. 77 cm 7 in A postcard of Vincent Van Gogh's painting Still Life with Irises Against a Yellow Background has dimensions 7 in and 5 in. The scale factor for the postcard to the original painting is 4.5. Using the scale factor, find the size of the actual painting. Using the Scale Factor l l w 5 in Scale Factor: 4.5 53 cm w 1 Scale Factor: 5