**error****Oops, try again. You have created a class with the name Equilateral?**

```
class Triangle(object):
number_of_sides = 3
def __init__(self, angle1, angle2, angle3):
self.angle1 = angle1
self.angle2 = angle2
self.angle3 = angle3
def check_angles(self):
if self.angle1+self.angle2+self.angle3==180:
return True
else:
return False
my_triangle = Triangle(90,30,60)
print my_triangle.check_angles()
print my_triangle.number_of_sides
class Equilateral(Triangle):
angle = 60
def __init__(self):
self.angle1 = angle
self.angle2 = angle
self.angle3 = angle
```

I can not find the mistake