Find the area of the region enclosed by the graph of x^2 + y^2 = 4x - 6y + 6.
Find the area of the region enclosed by the graph of x^2 + y^2 = 4x - 6y + 6.
x2 + y2 = 4x – 6y + 6
x2 + y2 – 4x + 6y = 6
x2 – 4x + y2 + 6y = 6
(x2 – 4x ) + (y2 + 6y ) = 6
(x2 – 4x + 4) + (y2 + 6y + 9) = 6 + 13
(x – 2)2 + (y + 3)2 = 19
The standard equation of a circle is (x – h)2 + (y – k)2 = r2
which means, in our equation, the radius squared equals 19.
Area of a circle is π r2
A = 3.1416 • 19
A = 59.69
.