radian
noun[C]
mathematicsspecializeduk/ˈreɪ.di.ən/us/ˈreɪ.di.ən/themeasureof anangleat thecentreof acircleoppositeanarc(=partof theedgeof acircle)that is the samelengthas theradius(= thelinefrom thecentreto theedgeof thecircle)
弧度Geometry: describing angles, lines & orientations
- acute
- angle of incidence
- angularity
- antinode
- asymptote
- asymptotic
- circuitous
- equilateral
- glancing
- indirect
- non-planar
- noncollinear
- obliquely
- obtuse
- orthogonal
- osculate
- projection
- prominent
- rectilinear
- reflection
You can also find related words, phrases, and synonyms in the topics:
Miscellaneous units of measurement