You find the scale factor on a triangle by dividing the short side by the long side.
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To find the scale factors of two objects, you need to compare the ratios of things like their sizes, areas, volumes, and length. For example, if one is given a volume of 7 for a shape, and a second shape has a volume of 14, you have to compare the volume ratio of these two shapes to find the scale factor. This scale factor is 1 to 2, or the volume of the second shape is twice the first one. Scale factors are useful for scale drawings.
A scale factor requires two measures.
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If the scale factor is r, then the new area will be the area of the original multiplied by r^2
Every part of the original scales by the same scale factor. By using a segment of the original you will determine the scale factor by dividing the length of the image by the length of the original.