diameter of a wire is 0.3 mm calculate its area in metre
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We know that ,
1m = 1000mm
So, 0.3mm=0.3÷1000m
=3÷ 10000m
d=2r ,r=d÷2
r=(3÷10000)÷2 {as d=3÷10000m}
r=3÷20000m
area of wire =πr*r
=(22÷7)*(3÷20000m)*(3÷20000m)
=7.071428571÷100000000m*m
1m = 1000mm
So, 0.3mm=0.3÷1000m
=3÷ 10000m
d=2r ,r=d÷2
r=(3÷10000)÷2 {as d=3÷10000m}
r=3÷20000m
area of wire =πr*r
=(22÷7)*(3÷20000m)*(3÷20000m)
=7.071428571÷100000000m*m
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