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If the Circumference is 6 ft. What is the radius?  

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lizwbryant | Student, Grade 9 | eNotes Newbie

Posted June 21, 2011 at 11:37 PM via web

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If the Circumference is 6 ft. What is the radius?

 

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academicsfirst | High School Teacher | (Level 2) Adjunct Educator

Posted June 21, 2011 at 11:50 PM (Answer #1)

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We are given the circumference of a circle.  We are asked to find the radius.


We will use the formula Circumference = 2pi(radius)

=> C=2pi(r)

=> Substitute 3.14 for pi, and 6 for C

=> 6 = 2(3.14)r

=> 6 = 6.28r

=>  .955 =r

=>  The radius is approximately .96 ft.

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sweetteach | Teacher | eNotes Newbie

Posted June 22, 2011 at 5:06 AM (Answer #2)

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To find the radius of a circle using the given circumference we use the formula for finding Circumference.

C=2pi(r)

Using 3.14 for pi and 6 for the Circumference, we solve for r (radius).

6=2(3.14)r     (multiply 2 times pi)

6=6.28r         (divide each side of the equal sign by 6.28)

r≈.955           (the result is that r is approximately .955)

Rounding to the nearest hundredths place the radius is about .96 ft.

 

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michaelcoffey | College Teacher | eNotes Newbie

Posted June 22, 2011 at 10:26 PM (Answer #3)

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First, divide the given circumference by 3.14 to get the diameter.

6/3.14=1.91

Second, Divide the answer by 2 to get the radius.

1.91/2 = .955

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