SOLUTION: What does the SAS version of the Law of Cosines have to say about the “triangle” whose sides p and q form a 180-degree angle?

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Question 1180132: What does the SAS version of the Law of Cosines have to say about the “triangle” whose sides p and
q form a 180-degree angle?
Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
It says the third side, r, has this relationship: r = p + q


Detailed steps:
r = +sqrt%28p%5E2+%2B+q%5E2+-+2pq%2Acos%28180%5Eo%29%29+
= +sqrt%28p%5E2%2Bq%5E2+%2B+2pq%29+
= +sqrt%28%28p%2Bq%29%5E2%29+
= +p%2Bq+