ư黻򥵥ݡȤ륯饹Math ⥸塼Ʊ
᥽åɤðۥ᥽åɤȤξƤΤǡðۥ᥽åɤƤ
ФƻȤȤȡ饹˥󥯥롼ɤƻȤȤȤξǤ


:

  pi = Math.atan2(1, 1)*4;
  include Math
  pi2 = atan2(1, 1)*4