Since −3
2 ≤ β ≤ 3
2 for this particular triangle, it follows that β must be −1
2 , 0, or
1
2 . Thus the only solutions of (5) are β = −1
2 , 0, and 1
2 . These correspond to the
orthocenter, incenter and circumcenter, respectively. We summarize the result in
the following theorem