Question

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what is the relation between perimetres of similar triangles

Answer 1

When two triangles are similar, the reduced ratio of any two corresponding sides is called the scale factor of the similar triangles.
If the ratios of corresponding sides are 6/3, 8/4, 10/5. These all reduce to 2/1. It is then said that the scale factor of these two similar triangles is 2 : 1.
Now, If two similar triangles have a scale factor of a : b, then the ratio of their perimeters is a : b.

Answer 2

Similar Triangles: Perimeters and Areas. When two triangles are similar, the reduced ratio of any twocorresponding sides is called the scale factor of the similar triangles.

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