bachelor-project-report/tikzs/arbitrary_subtriangle.tikz

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		\node [style=none] (3) at (0, 5.5) {$C$};
		\node [style=none] (4) at (-10.5, -4.25) {$A$};
		\node [style=none] (5) at (5.5, -4.25) {$B$};
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		\node [style=none] (18) at (2.4, 1.25) {$P_2$};
		\node [style=none] (19) at (-0.5, 2.5) {$\vec r$};
		\node [style=none] (20) at (-1.75, 0.75) {$Q$};
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