New Practical English 2 Unit One Unit One Passage I Passage I AreYouReally Being Invited AreYouReally Being Invited 制作:马洪涛.
Converting Degree Measure to Radian Measure Convert to radian measure: a) 210 0 180 0 or π rad ≈ 3.67 Exact radian Approximate radian b) - 315 0 To.