an iron was made by cutting out from A circular plate of radius 4 cm A concentric circular plate of radius 2 cm ( see fig ). what is the area of a face of the washer
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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
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Hello ❤️
Outer radius of the washer (R)= 4 cm
Inner radius of the washer (r)=2 cm
Area of the face of water=πR²-πr²
=π(R-r)²
=22/7(4²-2²)cm²
=22/7(16-4)cm²
=22/7×12cm²
=66cm²
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Hope it will help you ☺️
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