SOLUTION:

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Question 11703:
Found 3 solutions by askmemath, prabhjyot, Navieh13:
Answer by askmemath(368)   (Show Source):
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Circumference = 2 x Pi x Radius
2 x Pi x Radius = 14Pi
Dividing both sides with 2 x Pi
Radius = 7
Diameter = 2 x Radius = 2 x 7
Diameter = 14

Answer by prabhjyot(165)   (Show Source):
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circumference of a circle = pi*Diameter --->(1)
where pi= 3.14
Given circumference=14
plugging the values in equation(1)
14=pi*diameter
diameter= 14/pi
diameter= 4.45
radius= diameter/2=4.45/2= 2.22

Answer by Navieh13(1)   (Show Source):
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14 X Pi = 49.38
49.38 / 2 = 21.99
21.99 / 3.14 = 7.00
RADIUS = 7
7 X 2 = 14
DIAMETER = 14
answer confirmed in the back of 'Introductory and Intermediate Algebra for College Students' by Robert Blitzer