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Mathematics
Problem
x
2
+
2
x
+
y
2
−
4
y
−
9
=
0
x^2 + 2x + y^2 - 4y - 9 = 0
x
2
+
2
x
+
y
2
−
4
y
−
9
=
0
The equation of a circle in the
x
y
xy
x
y
-plane is shown above. If the area of the circle is
k
π
k\pi
k
π
, what is the value of
k
k
k
?
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