Question 310838
Let x = the length of one of the congruent sides.
The perimeter (P) can be expressed as:
{{{P = x+x+3x}}}
{{{P = 5x}}} Substitute P = 75.
{{{75 = 5x}}}
{{{x = 15}}} The lengths of the sides are:
15cm., 15cm., and 45cm.