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OpenStudy (anonymous):
I was given a circle with the radius of x+2 and the circumference of 31.40. Find the value of x.
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OpenStudy (sandra):
right, so the formula for the circumference of a circle is: \[c = \pi*d\] where d is the diameter of the circle (aka 2 times the radius)
OpenStudy (sandra):
so we have: \[31.40 = \pi*(x+2/2)\] \[31.40 = (\pi*x + 2*\pi)/2\]
OpenStudy (sandra):
actually sorry, easier to say : 31.40 = (pi * (x+2))/2 62.80 = pi*(x+2) x+2 = 62.80/pi And you have to finish the rest =)
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