You are given three angles in degrees. Your task is to determine whether they can form a valid triangle.
The angles are valid if each angle is greater than 0 and their sum is exactly 180 degrees.
Input: a = 60, b = 60, c = 60
Output: Valid
Explanation: The angles are all positive and sum to 180 degrees.
Input: a = 90, b = 60, c = 40
Output: Invalid
Explanation: The angles sum to 190 degrees, not 180.
Input: a = 0, b = 90, c = 90
Output: Invalid
Explanation: An angle of 0 degrees cannot exist in a valid triangle.
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