Grade 11Algebra
the number of comman tangents to the circle x2+y2-y+=0 and x2+y2+x=0 is
the number of comman tangents to the circle x2+y2-y+=0 and x2+y2+x=0 is
1 Answer
Arun
Dear student
C1 ( 0, 1/2) ; C2 (-1/2, 0)
r1 = 1/2 , r2 = ½
C1C2 = 1/sqrt (2)
r1 + r2 = 1
As r1 + r2 > C1C2
Hence inteesecting circles.
Hence no of common tangent = 2
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