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(x−h)2+(y−k)2=r2(x - h)^2 + (y - k)^2 = r^2(x−h)2+(y−k)2=r2
d=(x−h)2+(y−k)2d = \sqrt{(x - h)^2 + (y - k)^2}d=(x−h)2+(y−k)2
(x−h)2+(y−k)2=r2(x - h)^2 + (y - k)^2 = r^2(x−h)2+(y−k)2=r2 or d=rd = rd=r
(x−h)2+(y−k)2<r2(x - h)^2 + (y - k)^2 < r^2(x−h)2+(y−k)2<r2 or d<rd < rd<r
(x−h)2+(y−k)2>r2(x - h)^2 + (y - k)^2 > r^2(x−h)2+(y−k)2>r2 or d>rd > rd>r
Substitute coordinates into equation and compare with r2r^2r2
Compare (x−h)2+(y−k)2(x - h)^2 + (y - k)^2(x−h)2+(y−k)2 with r2r^2r2
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