



 
Nonsense! Doing mathematics for fun is never a waste of time! That said, for the answer to your question you must know that a plane is represented using coordinates by a "linear equation." What this means is that for any plane, there exists four constants a, b, c, d for which the points of space lie on the plane exactly when its coordinates x, y, and z satisfy the equation \[ax + by + cz = d.\] Your points satisfy $x + y + z = \pi.$ (That is, $a = b = c = 1, d = \pi.$) Chris  


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