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 (1)
or
x2 + y2 + 2ax – 2ay + a2 = 0