Question

A rectangle with sides 3 cm and 5 cm was enlarged in the ratio 1:3. Chapter Reference a How did the perimeter of the rectangle change?

Answer 1

It is three times as large

Explanation:

If a ration is also a fraction, and your wording is correct than an enlargement of 1:3 where 1 is the original shape would suggest that the 3 would be that same original shape, be enlarged in terms of 3 compares to 1 so a 300% enlargement.

if the original rectangle has a 16 cm perimeter, than the new rectangle has a 48 cm perimeter.