Question

Area of a sector?

Answer 1

can yo narrow it sown any?

Answer 2

err, can you narrow it down any. its these fat fingers i swear

Answer 3

@amistre64 Sorry, my class hasn't gotten this far yet :( It's on Study Island, so I have to do it but I don't understand it.

Answer 4

well, i see that 2 of them actually have proper math down in them ... so we should be able to narrow it down to the ones that use good math skills to start with

Answer 5

W and X? Because it's Pi r *squared, right?

Answer 6

X and Z

W is saying that:\[\frac{2\pi r^2}{\pi r}=\frac2\pi\]
and r^2/r does not equal 1 unless r is specifically equal to 1

Answer 7

@amistre64 https://www.youtube.com/watch?v=2ZYKVNT-VWA

Answer 8

oy these are hard to read thru with these old eyes lol

Answer 9

W and X are good choices yes

Answer 10

Area of a sector \[\Large A = \frac{ 1 }{ 2 }r^2 \theta \]
why are none of them correct?

Answer 11

i generally just go with:

Circumference is a full arc of radius r, and angle of 2pi: 2pi r

so the measure of the angle is used in the computations:

Answer 12

yeah, area of a sector is what they are looking for eh :/ and none of them are in r^2 which is prolly just human error when making it

Answer 13

id assume the human error and go with the next best assumption :)

Answer 14

W and Z are the closest choices. I really don't follow their steps though, neither seem like a good way to find the area of a sector.

Answer 15

W is the better of the two

Answer 16

2pi r^2
------ = area of a full circle: pi r^2
2


0r^2
---- for lack of a good theta key
2

Answer 17

W seems to have LESS mistakes. So go with that?

Answer 18

Ohh okay, thank you : )
Thanks @agent0smith as well. Sorry we just haven't been over this in class so I was confused.. but I think I'm getting it now.
lol I'll go with W.. Study Island has a lot of errors

Answer 19

yeah, take the lessest of all evils :)

Answer 20

W has lots of mistakes too! But seems to have less. Who knows, what a terrible question.

Answer 21

@jcari you should be confused by this, email whoever is in charge of this crap and tell them they need to be fired. I can't follow any of them very well.

Answer 22

HAHAH no one likes Study Island, wonder why. I don't know why it has to be required for school, but it counts for most of our grade /:

Answer 23

Actually I think Z might be less incorrect

Answer 24

I've no idea why they both have random pi's and such in both, and neither seem like a logical way to find area of a sector.