Answer:
What should I answer?
Step-by-step explanation:
we know that having similar triangles so the ratio of sides,area and volume are same.

we know that
will be the area of triangle.

so 
so the ratio of the perimeter of two triangles will be

ratio of the perimeter=
Answer:3/35
Step-by-step explanation:
It's a geometric sequence.

It's the sum for term 4 through term 15.