Yeah I was thinking the same thing but when reading I don't exactly realize..I don't know why.
Yes that actually about right.
Okay no problem its fine.
When posting an question it will give you to options 1 for a more relevant math question and another that is blue that is for more off topic NOT TO of topic but slightly.
Please don't put off topic post if you have more of a relevant off topic post post off topic when you submit.
oooooh sorry I never heard of hemisphere's before I proablly learn about those soon hopefully.
use the calculator.
Also the saxon math books series with dvd is extremly help ful but this costs money.
I recomend Khan acdemy for you it is amazing it teaches almost every math.
https://www.khanacademy.org/
I the answer I believe is 30 squared units. and your not dumb you won't get far discouraging yourself think more positive and you will be real good at whatever you aim for.