Re: Problems finding out the area of a 0.5mm circle.
- From: "Brian Reay" <see@xxxxxxxxxxxxxxx>
- Date: Tue, 31 Jan 2006 17:39:30 GMT
<johnpeterson02@xxxxxxxxxxx> wrote in message
news:1138714174.097592.18320@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Problems finding out the area of a 0.5mm circle.
>
> After doing the following equation 3.14 x 0.25 x 0.25, I get an area of
> 0.1963mm and I need the answer to be in nanometers thus I convert it,
> with the result being 196300 nano meters
I suggest you work in one unit, after converting early in the calculation.
In this case, you want an answer in square nm, work in nm from the
beginning.
>
> However when I try working out the same area (0.5 circle) using nano
> meters in the initial equation instead of mm (3.14 x 250,000 x 250,000)
> I get a bigger area of 196250000000 nano meters, which converts to
> 196300mm!
>
> Why is the area of a 0.5mm circle bigger when I work out the area in
> nanometers rather than mm?
It isn't. It seems you've not allowed for the squaring of the dimensions.
Eg.
1 sq cm isn't 10 sq mm, it is 100 sq mm. , ie a square 10mm x 10 mm.
Brian
.
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