an iron washer is made by cutting out from a circular plate of radius 5 cm , a concentric circular plate of radius 3 cm . fund the area of the washer
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r=5-3=2cm
area of washer =πr^2= 22×2×2/7= 88/7cm^2
area of washer =πr^2= 22×2×2/7= 88/7cm^2
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Area of the washer would be 50.24 cm²
1) The area of the iron washer would be the area of circle of radius 5 cm - area of circle of radius 3 cm.
2) The area of Larger circle would be 3.14*5*5= 78.5
3) The area of smaller circle would be 3.14*3*3= 28.26
4) Hence the area of Iron washer would be 78.5-28.26 = 50.24 cm²
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