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\( α\ +\ β\ =\ 170° \)
\( 131° 53'\ +\ β\ =\ 170° \)
\( β\ =\ 170° − 131° 53' \)
\( β\ =\ 38°7' \)
\( α\ +\ β\ =\ 180° \)
\( 131° 53'\ +\ β\ =\ 180° \)
\( β\ =\ 180° − 131° 53' \)
\( β\ =\ 50°7' \)
\( α\ +\ β\ =\ 180° \)
\( 131° 53'\ +\ β\ =\ 180° \)
\( β\ =\ 180° − 131° 53' \)
\( β\ =\ 48°7' \)
\( α\ +\ β\ =\ 190° \)
\( 131° 53'\ +\ β\ =\ 190° \)
\( β\ =\ 190° − 131° 53' \)
\( β\ =\ 58°7' \)