What is the diameter of the sphere x2+y2+z2−4x+6y−8z−7=0?
A
4 units
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B
5 units
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C
6 units
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D
12 units
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Solution
The correct option is D 12 units General equation of the circle is (x−a)2+(y−b)2+(z−c)2=r2 where (a,b,c) is center of circle and r is radius of circle.