# Plane angle

radian (rad)<

{{unitOption.title.replace('*','').replace('+','')}} ()

=

=

{{item.valueDto.value}}{{item.valueDto.value}} x 10

^{{{item.valueDto.exponent}}}Radian is a unit of planar angle and a derived unit of the Si system. Radian is a planar angle with a vertex in the center of the circle that delimits an arc of the same length as its radius at the circumference of the circle.