A sector is cut-off from a circle of radius 21cm. The angle of the sector is 120°. Find the length of its arc and the area.
Given,
Radius of sector = 21cm
Angle of sector = 120°
Length of arc = 
Area of sector = 
14
A sector is cut-off from a circle of radius 21cm. The angle of the sector is 120°. Find the length of its arc and the area.
Given,
Radius of sector = 21cm
Angle of sector = 120°
Length of arc =
Area of sector =