[SOLVED] Conversion help!

**Legendsn3verdie** · September 22nd 2008, 09:08 PM

calculate the area of your watch glass in cm^2, then convert to in^2.
Area = (pie)r^2

So the diameter of the watch glass was 10.10cm. Therefore, the radius is 5.05cm.. how do i conver 5.05 cm to cm^2????? can i just tag on a ^2 or is their another way to do this??

**Chris L T521** · September 22nd 2008, 09:20 PM

Originally Posted by Legendsn3verdie

calculate the area of your watch glass in cm^2, then convert to in^2.
Area = (pie)r^2

So the diameter of the watch glass was 10.10cm. Therefore, the radius is 5.05cm.. how do i conver 5.05 cm to cm^2????? can i just tag on a ^2 or is their another way to do this??

Since $r=5.05~cm$ , then the area would be $A=\pi\left(5.05~cm\right)^2\approx 80.12~cm^2$

Now to convert to inches, we see that $\frac{1~in}{2.54~cm}\implies \frac{1~in^2}{6.4516~cm^2}$

So then $A=80.12~cm^2\times\frac{1~in^2}{6.4516~cm^2}\appro x\dots$

Does this make sense? Can you finish this off?

--Chris

**Legendsn3verdie** · September 22nd 2008, 09:24 PM

Originally Posted by Chris L T521

Since $r=5.05~cm$ , then the area would be $A=\pi\left(5.05~cm\right)^2\approx 80.12~cm^2$

Now to convert to inches, we see that $\frac{1~in}{2.54~cm}\implies \frac{1~in^2}{6.4516~cm^2}$

So then $A=80.12~cm^2\times\frac{1~in^2}{6.4516~cm^2}\appro x\dots$

Does this make sense? Can you finish this off?

--Chris

hm so u got 80 for a answer? thats about what i was getting wasnt sure if it was right.

**Legendsn3verdie** · September 22nd 2008, 09:26 PM

actually answer is 12.4 right?

**Chris L T521** · September 22nd 2008, 09:28 PM

Originally Posted by Legendsn3verdie

actually answer is 12.4 right?

Keep in mind though, that the units are $in^2$ .

--Chris

**Legendsn3verdie** · September 22nd 2008, 09:29 PM

Originally Posted by Chris L T521

Keep in mind though, that the units are $in^2$ .

--Chris

aite thansk that deffintly helped big time for sure! ty.

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