Question is too ambiguous: what we know is that an isosceles triangle is one that has two lengths the same with the third length either longer or shorter. It is not clear where the angle 48.6 is - is it at the 'top' of the triangle between the two lengths that are the same size or is it at the 'side'? Even if you take the 'hypotenuse' as the longer length you could still potentially have two triangles described.
