101. 90°=90°•π/180°=90°•180°/180°=90°=π/2rad          π=180° 60°=60°•π/180°=60°=π/3rad 300°=300°•π/180°=300°=5π/3rad 10°=10°•π/180°=10°=π/18 45°=45°•π/180°=π/4rad 72°=72°•π/180°=2π/5rad 216°=216°•π/180°=6π/5rad -720°=-720°•π/180°=-4πrad 1200°=1200°•π/180°=20π/3rad 102. 2πrad=2•180°=360° -πrad=-180° π/5rad=180°/5=36° 3π/5rad=3•180°/5=108° -7π/12rad=-7•180°/12=-105° -π/36rad=-180°/36=-5° 12,5πrad=12,5•180°=2250° -6,25πrad=-6,25•180°=-1125° 104  a=π/2rad b=85°=90°>85° a=π/5rad  b=40°=36•<40° a=π/10rad b=17°=18°>17° a=2π/3rad b=130°=120°<130°

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