This is true for any triangle P 1 , P 2 , P 3 ∈ o {\displaystyle P_{1},P_{2},P_{3}\in {\mathfrak {o}}} .
Dies gilt für jedes Dreieck P 1 , P 2 , P 3 ∈ o {\displaystyle P_{1},P_{2},P_{3}\in {\mathfrak {o}}} .