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Mathematics 44 Online
OpenStudy (anonymous):

I was given a circle with the radius of x+2 and the circumference of 31.40. Find the value of x.

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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