There are 4. Drawn to scale:BTW, If you meant EXACTLY ONE side 7 cm, not TWO sides 7 cm, and EXACTLY ONE angle 50°, not TWO angles 50°, then there is only one such isosceles triangle, the upper left one with the base 7 and the vertex angle 50°. The others either have TWO sides 7cm or TWO angles 50° or both. Edwin