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Mathematics 13 Online
OpenStudy (jamesreed30):

Find the area of the circle with the given radius or diameter use pi equals 3.14 diameter equals 10

OpenStudy (blazeryder):

\[A=\pi \times r ^{2}\] It is very similar to the last question I helped you on

OpenStudy (blazeryder):

We know the diameter is 10. But how do we find the radius? |dw:1475866351048:dw|

OpenStudy (blazeryder):

@Jamesreed30

OpenStudy (jamesreed30):

10 times 2?

OpenStudy (jamesreed30):

10-5

OpenStudy (blazeryder):

It would be 10 divided by 2. The radius is always 1/2 the diameter.

OpenStudy (jamesreed30):

Okay so that's my answer?

OpenStudy (blazeryder):

How about I help you work through the problem. =)

OpenStudy (jamesreed30):

Sounds good

OpenStudy (blazeryder):

\[A=\pi \times r ^{2}\] We know the radius is 5 so plug 5 in where the r is at.

OpenStudy (blazeryder):

What do we do from there?

OpenStudy (jamesreed30):

So 5 times 5 = 25 then 25 times 3.14?

OpenStudy (blazeryder):

You got it!

OpenStudy (blazeryder):

SO what would your answer be?

OpenStudy (jamesreed30):

78.5?

OpenStudy (blazeryder):

Yup! \[78.5 units ^{2}\]

OpenStudy (jamesreed30):

Thank you once again!

OpenStudy (blazeryder):

Do you have any more questions? I can help you out =)

OpenStudy (jamesreed30):

Yes actually. MY next question says find the exact area of a circle having the given circumference eight pi

OpenStudy (jamesreed30):

But it has the PI symbol

OpenStudy (blazeryder):

Alright, start a new question and I will answer it. =) Please don't forget to medal!

OpenStudy (jamesreed30):

Yes sir you got it!

OpenStudy (blazeryder):

Thanks =)

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