，测度μ在集E上的限制- arcminute (= arc minute)
- arc of a circle
- arc of a cycloid
- AR-component (= Auslander-Reiten component)
- arc polygon
- arc quadrangle
- arc search method
- arcsecant (= arc secant)
- arcsec (= arcSec, arcsecant)
- arcsech (= arcSech)
- arc second
- arcsecond (= arc second)
- arc set
- arcsin (= arcSin, arcsine)
- arcsine (= arc sine)
- arcsine distribution
- arcsine law
- arcsine transformation
- arcsinh (= arcSinh)
- arc subset
- arctan (= arcTan, arctangent)
- arctangent (= arc tangent)
- arctanh (= arcTanh)
- arctg (= arctangent)
- arc-transitive graph