Question

a small metalic washer is of 7mm radius with a hole of 3.5mm radius. what is the area of a washer..??

Answer 1

area of washer(including hole)=πr^2
=22/7*7*7
=22*7
=154mm^2
area of hole=πr^2
=22/7*3.5*3.5
=22*0.5*3.5
=22*1.75
=38.5mm^2
area of washer(excluding hole)=154-38.5=115.5mm^2

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Answer 2

area of outer washer= pie r sq
22÷7×7×7=154m
area of inner washer or hole =22÷7×3.5×3.5
=38.5
area of washer =154-38.5=115.5