Frank Bullitt Posted January 18, 2018 Share Posted January 18, 2018 Never a strong point with me when trying to work out anything bar the basics. I am trying to convert inch into cm2 and mm2 respectively. My workings so far... 3.5” = 8.89 cm or 88.9mm 8.89 x 8.89 x 3.142 (PI) ÷ 4 = 62.07cm2 or for mm2 88.9 x 88.9 x 3.142 (PI) ÷ 4 = 6207.97mm2 Is this correct? Link to comment Share on other sites More sharing options...
Mk4Gaz Posted January 18, 2018 Share Posted January 18, 2018 To find the area of a circle is indeed pi x r2. So 8.89/2 = 4.445 4.445 x 4.445 x 3.14 = 62.04 cm2 Link to comment Share on other sites More sharing options...
Axl Posted January 18, 2018 Share Posted January 18, 2018 The only equation I know is twin turbo plus twin turbo is 4 minus N/A is 3 quick math Link to comment Share on other sites More sharing options...
Frank Bullitt Posted January 18, 2018 Author Share Posted January 18, 2018 So I don’t need to divide by 4 if using the diameter measurement? Link to comment Share on other sites More sharing options...
Mk4Gaz Posted January 18, 2018 Share Posted January 18, 2018 You can use the diameter and divide by 4, but the correct equation is pi x r2, so if you divide the diameter by 2, you get the radius. Then square the radius and multiply by pi (3.14159) or 3.14 in short Link to comment Share on other sites More sharing options...
Glanza_Mike Posted January 18, 2018 Share Posted January 18, 2018 Well i feel dumb. Link to comment Share on other sites More sharing options...
Frank Bullitt Posted January 18, 2018 Author Share Posted January 18, 2018 The only equation I know is twin turbo plus twin turbo is 4 minus N/A is 3 quick math I have no idea how to reply to this You can use the diameter and divide by 4, but the correct equation is pi x r2, so if you divide the diameter by 2, you get the radius. Then square the radius and multiply by pi (3.14159) or 3.14 in short /QUOTE] Thanks Gary, pm incoming. Well i feel dumb. I thought Maths would be right up your street. Link to comment Share on other sites More sharing options...
Glanza_Mike Posted January 19, 2018 Share Posted January 19, 2018 It is, i'm usually good at maths, came in here thinking damn right i'm good at maths, then left immediately Link to comment Share on other sites More sharing options...
Mk4Gaz Posted January 20, 2018 Share Posted January 20, 2018 It is, i'm usually good at maths, came in here thinking damn right i'm good at maths, then left immediately Link to comment Share on other sites More sharing options...
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