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Uholy trojuholníka
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\( α = 20°, β = 80° \) a \( \normalsize\gamma=80\degree \)
\( α + β + γ = 20° +\ 80° +\ 70° =\ 170° \)
\( \large 170\degree \neq 180\degree \)
\( α + β + γ = 20° +\ 80° +\ 80° =\ 190° \)
\( \large 190\degree \neq 180\degree \)
\( α + β + γ = 30° +\ 80° +\ 80° =\ 190° \)
\( \large 190\degree \neq 180\degree \)
\( α + β + γ = 20° +\ 80° +\ 80° =\ 180° \)
\( \large 180\degree = 180\degree \)