7. Circles in the Coordinate Plane
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What is the standard equation of a circle?
x^2+y^2=49
(x- h)^2+(y- k)^2= r^2 In this form, ( h, k) is the center of the circle and r is its radius. We are told that the center of the circle is ( 0, 0) and its radius is 7. This information is enough to write the equation. (x- 0)^2+(y- 0)^2= 7^2 ⇕ x^2+y^2=49