Question: Let P.Q, R be noncollinear points in an absolute geometry, i.e. in a Euclidean plane not necessarily having unique parallels. Is it possible that

Let P.Q, R be noncollinear points in an absolute geometry, i.e. in

Let P.Q, R be noncollinear points in an absolute geometry, i.e. in a Euclidean plane not necessarily having unique parallels. Is it possible that |LPQR| + |ZQPR 180? Prove your answer!

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