right angle
noun[C]
uk/ˈraɪt ˌæŋ.ɡəl/us/ˈraɪt ˌæŋ.ɡəl/anangleof 90°:
直角Asquarehas fourrightangles.正方形有4个直角。
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Geometry: describing angles, lines & orientations
- acute
 - angle of incidence
 - angularity
 - antinode
 - asymptote
 - asymptotic
 - bisector
 - circuitous
 - equilateral
 - indirect
 - non-planar
 - noncollinear
 - obliquely
 - obtuse
 - orthogonal
 - osculate
 - projection
 - prominent
 - rectilinear
 - sine