The center of a circle is at (−2, −7) and its radius is 6.

what is the equation of the circle?

a. (x−2)2+(y−7)2=3

b. (x+2)2+(y+7)2=3

c. (x+2)2+(y+7)2=36

d. (x−2)2+(y−7)2=36

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Find the length of the following tangent segments to the circles centered at o and o' whose radii are 5 and 3 respectively and the distance between o and o' is 12. what is the tangent segment of cd?