[tex] \alpha + 40 ° = 90 ° \\ \alpha = 90 ° - 40 ° \\ \alpha = 50 ° [/tex]
[tex]180 ° = \alpha + 50 ° + ψ \\ 180 ° = 50 ° + 50 ° + ψ \\ 180 ° = 100 ° + ψ \\ 180 ° - 100 ° = ψ \\ 80 ° = ψ [/tex]
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[tex] \alpha + 40 ° = 90 ° \\ \alpha = 90 ° - 40 ° \\ \alpha = 50 ° [/tex]
[tex]180 ° = \alpha + 50 ° + ψ \\ 180 ° = 50 ° + 50 ° + ψ \\ 180 ° = 100 ° + ψ \\ 180 ° - 100 ° = ψ \\ 80 ° = ψ [/tex]