第2个回答 2012-08-14
30°=π/6=0.52359877559829887307710723054658
45°=π/4=0.78539816339744830961566084581988
60°=π/3=1.0471975511965977461542144610932
90°=π/2=1.5707963267948966192313216916398
120°=2π/3=2.0943951023931954923084289221863
150°=5π/6=2.6179938779914943653855361527329