［例选］(1)57.32°=____度_____分____秒;(2)27°14′24″= ________度.
分析：从大的单位化为小的单位用乘法,像(1)题，反之用除法，如(2).
57.32°=57°+0.32°=57°+60′×0.32
=57°+19.2′=57°+19′+0.2′
=57°+19′+60″×0.2
=57°19′12″
27°14′24″=27°14′+24″÷60°
=27°14′+0.4′=27°+14.4′
=27°+14.4÷60
=27°+0.24°=27.24°
一、填空题
1.45°=_____直角=_ _____平角=_____周角.
2.∠α+∠β=90°,且∠α=2∠β,则∠α=___________，∠β=_________.
