Marta is making two different charms for necklace one charm has a 1 cm diameter and a 3.14 centimeter circumference a similar charm has a diameter of 4 cm what is the circumference

Both charms are "similar".

And notice one diameter is 1, the other is 4, the diameters are on a ratio of 1:4 then, and so both figures are on a ratio of 1:4.

so, if another unit, like the circumference is at 3.14 on the small one, then the large one will have a circumference 4 times that much, because the circumferences are also on a 1:4 ratio.