Melody

2 answers WOW

2 for the price of one - arn't you the lucky anon.

Actually it is kind of good.  You should be able to work out where the error lies.  :)

It is an excellent learning technique. 

Thanks Geno. :)

just put it straight into the site calc

-0.098*(30) + ln( 20^2.7)

I don't know about easiest but this is pretty easy.

Just do it on the calc on the home page.

Why would you want to do that?

circumference = pi*d

or

circumference = 2pi*r

Isn't it great when questions fall out like this?  Thanks Geno :)

if you mean inverse trig it is called arc trig here

atan, acos and asin