Question

An isosceles triangle has an area of18 what are the lengths of the legs

Answer 1

no way to tell, but if the height is h and the base is 2x, then

there are two sides of length √(x^2+(18/x)^2)
so some possibilities are
4,√85,√85
6,√45,√45
and so on
Now , if you meant the perimeter is 18, then there are lots of integer possibilities, such as 6,6,6