Posted by **elodie** on Sunday, April 24, 2011 at 10:05am.

In the standard (x,y)cooridniate plane the graph of (x-2)second power +(y+4 second power =9 is a circle. What is the area enclosed by this circle, expressed in sguare coordinate units?

please help me?

- algebra 1 -
**Jai**, Sunday, April 24, 2011 at 10:24am
recall that the equation of a circle is given by

(x-h)^2 + (y-k)^2 = r^2

where

h = x-coordinate of center of circle

k = y-coordinate of center of circle

r = radius

thus from the given equation,

(x-2)^2 + (y+4)^2 = 9

the radius is sqrt(9) = 3

also, recall that area of circle is given by

A = pi*r^2

substituting,

A = pi*(3)^2

A = 3.14*9

A = 28.26 square units

hope this helps~ :)

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