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Mathematics 22 Online
OpenStudy (anonymous):

Find the circumference and the area of the circle. (Picture in question)

OpenStudy (anonymous):

|dw:1418953162163:dw|

OpenStudy (danjs):

Have you learned about the circumference and area formulas?

OpenStudy (anonymous):

yes in the past. but i forgot and i am not very fond of this subject

OpenStudy (danjs):

Circumference = 2 * pi * radius

OpenStudy (danjs):

Area = pi * r * r

OpenStudy (anonymous):

2 times 3.14 times 48?

OpenStudy (danjs):

yes, that is the approximate circumference using pi = 3.14

OpenStudy (anonymous):

301.44?

OpenStudy (danjs):

yes. now find the area

OpenStudy (anonymous):

what is the r in that formula

OpenStudy (danjs):

it is the same circle, same radius as the r in the circumference calculation.

OpenStudy (anonymous):

2 times 48 times 48?

OpenStudy (danjs):

yes,

OpenStudy (anonymous):

isnt area Pi r squared

OpenStudy (danjs):

Units for circumference [in.] Units for Area [in.]^2

OpenStudy (danjs):

yeah r^2 "r squared" is the same as r x r

OpenStudy (danjs):

\[Area = \pi * r^2 = \pi * r * r\]

OpenStudy (anonymous):

7234.56

OpenStudy (danjs):

yes...square inches in^2

OpenStudy (anonymous):

thanks. i have some more questions if you dont mind. I have my final tomorrow and i am having trouble reviewing

OpenStudy (danjs):

ok

OpenStudy (anonymous):

find the circumference and area of the circle

OpenStudy (anonymous):

|dw:1418953691986:dw|

OpenStudy (anonymous):

@DanJS

OpenStudy (danjs):

For this one they gave you the entire diameter of the circle. Remember the radius is half of the diameter.

OpenStudy (anonymous):

half of 34 is 17

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