Answer :

0Claudia0
TO find perimeter you add all sides. But to find the totaly of each side, you will divide. So a triangle has 3 sides, so you divide 45 by 3 to get the sides length of:
15 cm each
~hope this helped :)
apologiabiology
it depends on what kind of triangle
if it is an euilateral triangle (all side legnths are the same measure) then the lenght of each side is 45/3=15

if it is an isocolees (2 sides are same legnth) then I don't know
if other, then I don't know