SOLUTION: X^2+y^2=4 find the circumference

Question 886226: X^2+y^2=4 find the circumference
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
X^2+y^2=4 find the circumference
.
Standard form of a circle is:
(x-h)^2 + (h-k)^2 = r^2
if the center of the circle is at (0,0) we have:
x^2 + y^2 = r^2
from inspection of:
X^2+y^2=4
we know that the radius(r) is 2
.
Circumference is:
(pi)D
or
(pi)(2r)
(3.14)(2*2)
(3.14)(4)
12.56 (circumference)
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