EAMCET Engineering 2004 Solved Paper

Given lines are
x+y−1=0,x−y−1=0‌ and ‌y+1=0
These lines form a triangle the total number of circles that touches all the three sides of a triangle are 4.
[∵ One is incircle of a triangle and when we extend the sides of a triangle we will get the three ex-circle which touches all sides of a triangle]