how many different triangles can be formed with three sides defined
Rating Newest Oldest. Best Answer: Hi, There are 6 different isosceles triangles with whole number sides and a perimeter of 25. 12-12-1 11-11-3 10-10-5 9-9-7 8-8-9 7-7-11 I hope that helps!!:-).ating Newest Oldest. Best Answer: Hi, There are 6 different isosceles triangles with whole number sides and a perimeter of 25. 12-12-1 11-11-3 10-10-5 9-9-7 8-8-9 7-7-11 I hope that helps!!