Solve the programming task below in a Python markdown code block.
Implement a method that accepts 3 integer values a, b, c. The method should return true if a triangle can be built with the sides of given length and false in any other case.

(In this case, all triangles must have surface greater than 0 to be accepted).
Also feel free to reuse/extend the following starter code:
```python
def is_triangle(a, b, c):
```