Question

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

Answer 1

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)

Answer 2

so we have:
\[31.40 = \pi*(x+2/2)\]
\[31.40 = (\pi*x + 2*\pi)/2\]

Answer 3

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 =)