right angle
US /ˌraɪt ˈæŋ.ɡəl/
UK /ˌraɪt ˈæŋ.ɡəl/
1.
an angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines
:
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The two walls meet at a perfect right angle.
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Draw a line perpendicular to the base to form a right angle.