If the endpoints of a diameter of a circle are A(-9, 10) and
B (-5, -4), what is the circle's radius?

Correct answer:

r =  7.3

Step-by-step explanation:

(2r)2=dx2+dy2 4r2=(9+5)2+(10+4)2 r=21(9+5)2+(10+4)2 r=7.3

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