Scaling figures, scale factor, and similarity ratio (7th grade math)

Scaling a geometric figure or a drawing means enlarging or shrinking it proportionally. In this process, all the dimensions get multiplied by a scale factor.

The similarity ratio is the ratio of any side (or dimension) of the figure and the corresponding side (or dimension) of the scaled figure. We look at examples of this and how the similarity ratio relates to the scale factor.

Lastly we solve for an unknown side when two similar figures are given.

See also

How to calculate distances on the map or in reality using the map scale

Math Mammoth Grade 7 curriculum (pre-algebra)

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