an iron waaher is made by cutting out from a circular plate of radius 5cm,a concdntric circular plate of radius 2cm. find the area of face of the washer

Area of face of the washer = Area of iron plate having radious of 5 cm - Area of concentric circle having radious of 2 cm . (Area of a circle = Pie ? radious square) So, Pie ? 5 ?5 - Pie ? 2 ?2 =Pie (25-4) =(22?7)21=22?3=66 sq cm