AP EAPCET 24-Aug-2021 Shift 1 Paper

Section: Mathematics
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Question : 54 of 160
 
Marks: +1, -0
If the circles x2+y2−6x−8y−12=0 and x2+y2−4x+6y+k=0 are perpendicular to each other, then ' k ' equals ______
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