My output does not match for sample input.
For each test case, my procedure is.
1.Read R1,R2,R3.
Make a triange by center of given 3 circles.
2.
Evaluate 3 sides of the triangle.
s12=R1+R2; s13=R1+R3; s23=R2+R3;
Finf out Area of the triangle.
Suppose Area is A.
3.
Find out angle of each point of the triangle.
A1=asin((2*A)/(s12*s13))
A2=Same formulae.
A3=Same formulae.
Convert A1,A2,A3 into degree from radian.
4.Find out area of part of each circle which is inside triangle.
v1=(pi*R1*R1*A1)/360
v2=same process
v3=same process
5.Sum=v1+v2+v3.
5.result=A-sum.
6.Display result with 6 decimal place.
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