A scale drawing of an object is the same shape at the object but a different size. The scale of a drawing is a comparison of the length used on a drawing to the length it represents. The scale is written as a ratio. The ratio of two corresponding sides in similar figures is called the scale factor.
Scale factor= length in image / corresponding length in object.
If one shape can become another using revising, then the shapes are similar. Hence, two shapes are similar when one can become the other after a resize, flip, slide or turn. In the photograph below showing the side view of a train engine. Scale factor is `1:200`.
This means that a length of `1` cm on the photograph above corresponds to a length of `200` cm or `2` m, of the actual engine. The scale can also be written as the ratio of two lengths.
The length of AB in the given figure:

Options

A. `8` cm
B. `6` cm
C. `4` cm
D. `10` cm

Answer

C