Question

Circumference, SA, Volume, of a bowling ball.
I did the problem I just want someone to check it for me. Please! (:
(Project Grade!)

Answer 1

It looks right to me.
Do you have to care about significant figures?

Answer 2

Hmm... No... I have two more problems. Can you check them out for me?

Answer 3

Also, did you notice that \(SA = C^2/\pi\) ? It might come in handy if you don't want to bother to solve for \(r\) at some point.

And sure!

Answer 4

Wait, I think I do have to care about significant figures... Will it give me a different answer? That question just confused me more... )':

Answer 5

Yes, it will.
But better to know and be confused and figure it out than get it wrong!

Answer 6

I am going to email my teacher and ask. Okay? one moment..

Answer 7

Ok!

Answer 8

I'm going to look around, but mention me and I'll pop back in.

Answer 9

Ok(:

Answer 10

Oh, so you measured that 27 yourself?

Answer 11

Yes. (:

Answer 12

Can you say confidently it is 27.0 inches? (that is to say, not actually 26.9 or 27.1)

Answer 13

To be honest I just made up it's measurement. It doesn't matter though, I just need the right answer for the measurement I chose.

Answer 14

Ok, let's say you can, it makes your numbers look better.

Answer 15

That means you have three significant figures: 2, 7, and 0. You don't know anything beyond that (it'd be hard to measure to be assured it was 27.00 and not 27.01 or whatever)

Answer 16

So that means your radius has three significant figures also: 4.30

Answer 17

Ugh. but then I would have to re write everything! And re sketch all my figures...... ):

Answer 18

Ok, well. It doesn't say anything about them so maybe you don't have to care!

Answer 19

Anything about what?

Answer 20

Significant figures. Your assignment doesn't mention them so maybe you don't have to care about them.

It's more of a thing they drill into your head in science class rather than math class but I thought I'd ask since you're measuring stuff.

Answer 21

Oh okay, so... this problem is correct? lol.

Answer 22

Ignoring this minor issue, yes, I think so!

Answer 23

I want to hear "I know" so not "I think" so! lol. This is a project grade.

Answer 24

How about this? I did the calculations myself without using anything you wrote and got the same results as you. :)

Answer 25

That made me feel more confident in my answer.. lol. I'm posting a new picture of my other spherical figure in a new thread.