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Mathematics 8 Online
OpenStudy (liv1234):

@vocaloid Can you help me please?

OpenStudy (liv1234):

Vocaloid (vocaloid):

what is the circumference of the circle?

OpenStudy (liv1234):

3

Vocaloid (vocaloid):

nope

OpenStudy (liv1234):

9.42?

Vocaloid (vocaloid):

circumference = pi * diameter = ?

OpenStudy (liv1234):

9.42

Vocaloid (vocaloid):

nope

Vocaloid (vocaloid):

what is the diameter?

OpenStudy (liv1234):

Isn't the diameter the radius?

Vocaloid (vocaloid):

no

Vocaloid (vocaloid):

diameter = 2 * radius = ?

OpenStudy (liv1234):

6?

Vocaloid (vocaloid):

good! now, circumference = 2 * radius = ?

OpenStudy (liv1234):

6!

Vocaloid (vocaloid):

sorry typo

Vocaloid (vocaloid):

circumference = pi * diameter = ?

OpenStudy (liv1234):

3.14*6? @Vocaloid

OpenStudy (liv1234):

@Vocaloid Is that correct?

Vocaloid (vocaloid):

yes, and that equals...?

OpenStudy (liv1234):

18.84 @Vocaloid

Vocaloid (vocaloid):

good now we calculate the arc length/the total angle measure inside the circle

OpenStudy (liv1234):

How would we do that?

Vocaloid (vocaloid):

(5pi/3) divided by 2pi = ?

OpenStudy (liv1234):

5.2/6.28 right?

Vocaloid (vocaloid):

yes

OpenStudy (liv1234):

That doesn't give me the right answer though.

Vocaloid (vocaloid):

we're not done yet

OpenStudy (liv1234):

Ohh alright, well I got 0.828

Vocaloid (vocaloid):

good, now we multiply that by the circumference

Vocaloid (vocaloid):

let me know what you get

OpenStudy (liv1234):

@Vocaloid I got 4.968 which rounded gets me 5

OpenStudy (liv1234):

Is that the answer? Option D? 5.0? @Vocaloid

Vocaloid (vocaloid):

yes good

OpenStudy (liv1234):

Thanks!!(:

Vocaloid (vocaloid):

wait

OpenStudy (liv1234):

Okay.

OpenStudy (liv1234):

Was it wrong?

Vocaloid (vocaloid):

what's the circumference?

OpenStudy (liv1234):

6 right?

Vocaloid (vocaloid):

no

Vocaloid (vocaloid):

circumference = pi * diameter = ?

OpenStudy (liv1234):

Ohh, then I made a mistake calculating.

OpenStudy (liv1234):

3.14*2?

Vocaloid (vocaloid):

what's the diameter?

OpenStudy (liv1234):

Wasn't the diameter 2?

OpenStudy (mathstudent55):

5pi/3 is almost a full circle, so the arc length must be the greater part of the circumference.

Vocaloid (vocaloid):

no

Vocaloid (vocaloid):

review our earlier work

OpenStudy (liv1234):

I just did that and I'm confused.

Vocaloid (vocaloid):

we found the diameter before. scroll back up and see what it is

OpenStudy (liv1234):

The diameter is 3*2

Vocaloid (vocaloid):

which is 6

OpenStudy (liv1234):

right, so isn't that the circumference?

Vocaloid (vocaloid):

then what is the circumference, if circumference = pi * diameter?

Vocaloid (vocaloid):

diameter and circumference are not the same thing

OpenStudy (liv1234):

18.84 is the circumference

Vocaloid (vocaloid):

good

Vocaloid (vocaloid):

now multiply 0.828 * 18.84

OpenStudy (liv1234):

15.599, but rounded that's 15.6

OpenStudy (mathstudent55):

@Liv1234 Perhaps a reason you're confused is that you opened a post with this question earlier, and you were being helped. Then you stopped responding and closed the post. Then you opened a new post with the same question. Once you have someone helping you, you should stick to it to the end.

Vocaloid (vocaloid):

good, so the closest answer voice is 15.7 (rounding error probably)

OpenStudy (liv1234):

I know, but you stopped in the middle of helping me so I opened a new post. And thank you! @Vocaloid

OpenStudy (mathstudent55):

You need to be patient. Sometimes OS responds very slowly. It seems like someone stopped answering when they are just waiting for OS to work. Sometimes I need to log off and log back on to get OS to respond.

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