hú dù
radian
arc
curve
curvature
yuán hú
arc of a circle
circular arc
hú cháng
arc length (the length of a curve segment)
dǎo hú
island arc (geology)
forearc
hú xiàn cháng
arc length
length of a curve segment
hú cháng cān shù
parametrization by arc length (of a space curve)
tóng zhóu yuán hú
coaxial circular arc
concentric arc (in spherical geometry)