A sector is cut from a circle of radian 21cm.Area of circle = πr2Given r=21cm.∴ Area = π(21)2=441.πcm2∴ Given angle of the sector = 150∘∴ fraction of circle = 360150​=125​∴ Sector occupies the area of 125​×441π=125​×441×722​=577.5cm2length of the arc = 125​ of circumference=125​×2πr=125​×2×722​×21=55cm