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.

1 answer

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.