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Excel formula I have a round disc 1800mm in diameter I want to calculate in excel the surface area of 1800mm in m2 and i have 38 discs. what is the total surface area inn square metres is it 1800*3.14=5652 5.65square metres ?

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  • pi314 Feb 28, 2008

    so does that mean 966 sq metres of surface area or less than 1 sq metre .966 ?

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The formulae for the surface area of round disc is
pi * r * r
where pi=3.14 and r =radious of disc= diametre/2 

for this 1st u have 2 calculate the radious of the disc that is
180/2=90mm
then convert it to  m by dividing 1000 ,so radious=90/1000=0.09 m
finally calculate the area= 3.14 * 0.09 * 0.09=0.025434 sq metres
for 38 disc multiply 38 with the above area that is
0.025434 * 38=0.966492 sq metres

in excel 2007  u can do it more easily by going 2 formulas tab.
Under formla tab click on engineering formula and  then convert
here u can convert from mm to m
after converting use the above formula i just told u.

Posted on Feb 27, 2008

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