[tex]2 θ + 3 θ + 90 ° = 180 ° \\ 5 θ + 90 ° = 180 ° \\ 5 θ = 180 ° - 90 ° \\ 5 θ = 90 ° \\ θ = 90 ° \div 5 \\ θ = 18 ° [/tex]
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[tex]2 θ + 3 θ + 90 ° = 180 ° \\ 5 θ + 90 ° = 180 ° \\ 5 θ = 180 ° - 90 ° \\ 5 θ = 90 ° \\ θ = 90 ° \div 5 \\ θ = 18 ° [/tex]