They have 9 because
8k = 0 A.)8 B.)16 C.)0 D.)4
2 answers:
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we know that
the equation of the circle is of the form
where
(h,k) is the center of the circle
r is the radius of the circle
in this problem we have
so
the center is the point
the radius is
therefore
the answer is
The radius of the circle is equal to