Solution Let C denote the family of circles in the second quadrant and touching the
coordinate axes Let (–a, a) be the coordinate of the centre of any member of
this family (see Fig 9 6) © NCERT
not to be republished
MATHEMATICS
416
X
X’
Y
Y’
(– , )
a a
O
Equation representing the family C is
(x + a)2 + (y – a)2 = a2