## Problem Description

To make things easier, WishingBone decides to put this simple geometry problem
at the beginning. Given a triangle, what is the ratio of the area of its inscribed
circle to that of its circum circle?

## Input

9 integers x1 y1 z1 x2 y2 z2 x3 y3 z3 on one line (-1000 <= x, y, z <=
1000), the three coordinates of the triangle. The three coordinates will not
appear collinear.

Process to the end of file.

## Output

One ratio per line, exact to three digits to the right of the decimal point.

## Sample Input

0 0 0 0 0 1 0 1 0

## Sample Output

0.172

## Source

WishingBone