Question 12656: An isosceles triangle with a base of 5cm has a perimeter of 30cm.How long are each of the other two sides? Answer by AdolphousC(70) (Show Source): You can put this solution on YOUR website! An Isosceles triangle has two equal sides, if one side is 5cm, the other two sides together have to be 25cm, since the permeter ( distance around ) is 30.
So if the other two sides together are 25, then each side must be 25/2 = 12.5cm