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1. Oxford Dictionary

   right angle

   • IPA[ˈrʌɪt ˌaŋɡl]

   英式

   • n.
     an angle of 90°, as in a corner of a square, or formed by dividing a circle into quarters.

   • noun: right angle, plural noun: right angles

2. • 片語

   片語

   • at right angles to