An iron washer is made by cutting out from a circular plate of radius 4 cm a concentric circular path of radius 2 cm (Seen Fig) . What is area of a face of the washer?`
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Answer:
R = 4cm , R = 2cm
area of washer = π(R+r) (R-r)
=3.14 × 6 ×2
3.14×12
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