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 200cm or 2 m, of the actual engine. The scale can also be written as the ratio of two lengths.
If two similar triangles have a scale factor `5:3`. which statement regarding the two triangles is true?

Options

A. The ratio of their perimeters is `5:3`
B. Their altitudes have a ratio `29:15`
C. Their medians have a ratio `10:4`
D. Their angle bisectors have a ratio `11:5`

Answer

B