Question 672313
In two similar triangles, the ratio of their areas is the square of the ratio of their sides =25/16

in Similar Triangles - ratios of parts, the perimeter, sides, altitudes and medians are all in the same ratio. Therefore, the area ratio will be the square of any of these ratios too.

so the ratio of the perimeters=sqrt(25/16)=5/4
one perimeter=15
so the 2nd perimeter=15*4/5=12
ans