In an isosceles triangle, the perimeter is 75 cm and one of the sides is 25 cm. Find all its sides. Can you find all angles of the triangle? Explain your answer.

Answer 1

case1: One of the two equal sides is 25, then
2(25) + x =75
x = 25, and the triangle is equilateral, and all angles are 60°

case2: the base side is 25
then 2s + 25 = 75
2s = 50
s = 25
ahhh!, same thing.