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1. Oxford American Dictionary

   right angle

   • IPA[ˈrīd ˌaNGɡ(ə)l]

   美式

   • n.
     an angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines.

   • noun: right angle, plural noun: right angles

2. • 片語

   片語

   • at right angles to