a) 43⁰+47⁰ = 90⁰ => sint complementare
b) 23⁰43'27''+ 66⁰17'33'' = 90⁰ => sint complementare
c) 1/3 ·67⁰30'+67°30'= 22⁰30'+67⁰30' = 90⁰ => sint complementare
2a) 123°42'35''+56°57'65'' = 180⁰40'40'' => nu sint suplementare
2b) 4 · 36+36 = 5· 36 = 180⁰ => sint suplementare
2c) 1/7 · 157°30'+157°30' = 22⁰30' + 157°30' = 180⁰ => sint suplementare