Assuming that they are meant to be straight lines, thus making it a triangle, you wouldn't have 3 equal sides with a right angle.
If the lines aren't straight. You could have 3 equal sides and a right angle. But because there is no radian degree giving for the curved line, you would be assuming they are a curved line.
Or to solve this we could rely on probability of past experiences. But because we know from philosophy that our past experiences can sometimes be deceiving we can't trust them.
So we would need to know one of the following to solve this.
1. What the coordinates are for the points that the lines endpoints are.
2. The radius, range of radian of the angles and center points of the three arcs.
3.What philosophy we can use so we can apply the the correct probability from past experiences, which would lead us to believe that IT IS A FUCKING TRIANGLE.