Hur kan detta bli fel, cosinus satsen.

$p y t h' s s a t s A B = c \Rightarrow c^{2} = 5^{2} + 3^{2} \Rightarrow (A B = \sqrt{33}) A C = c \Rightarrow c^{2} = 6^{2} + 3^{2} \Rightarrow (A C = \sqrt{46}) B C = c \Rightarrow c^{2} = 6^{2} + 5^{2} \Rightarrow (B C = \sqrt{61}) \cos s a t s {\sqrt{61}}^{2} = {\sqrt{46}}^{2} + {\sqrt{33}}^{2} - 2 \cdot \sqrt{46} \cdot \sqrt{33} \cdot \cos (A) A = \cos^{- 1} (\frac{{\sqrt{61}}^{2} - {\sqrt{46}}^{2} - {\sqrt{33}}^{2}}{- 2 \cdot \sqrt{46} \cdot \sqrt{33}}) \approx 76.6$

$5^{2} + 3^{2} \neq 33 6^{2} + 3^{2} \neq 46$

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