How do I calculate the third side of an isosceles triangle when the 2 equal sides (5cm and 5cm) are given and no angles are provided (no options provided either)?

Answer 1

If there is no other information given at all, you can't. The third side could be anything from just over 0 cm to just under 10 cm. You have to know at least one other fact such as the perimeter, an interior or exterior angle, or the area.