A isosceles triangel has the perimeter 10 cm. Signbfor the base andsfor the sides.

Decide the function's domain and range. According to the key the answers should be:

D:0<s<5

V: 0<v<10.

How can these answers be possible? If the base are 9 cm, then the two sides of the triangel have to be 0.5 cm each and then they will not form a triangel. Can you please explain? Thank you in advance.