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Since it is a ratio, the length scale factor can also be written using colon notation. However, it is usually written as a constant that describes the relationship between the dimensions of the scale drawing or scale model and the actual dimensions.
The length scale factor definition also applies for similar figures. Examine these two similar triangles.
The length scale factor used to get △PQR from △ABC is the ratio between a measure on the new figure, △PQR, and the corresponding measure on the initial figure, △ABC. Here, PR and AC are corresponding sides. Therefore, the length scale factor is the ratio between PR and AC.