[填空题]
Express the following anglesco;; uys f. t+/r9tvva in radians: (a)fzlwg;x vbsxxr- +l51bzaq52ma 0a17 30 $^{\circ} $, (b) 57 $^{\circ} $, (c) 90 $^{\circ} $, (d) 360 $^{\circ} $, and (e) 420 $^{\circ} $. Give as numerical values and as fractions of $\pi$.(Round to two decimal places) (a) $rad$ (b) $rad$ (c) $rad$ (d) $rad$ (e) $rad$