PROGRAMMING:Find the area where two circles intersect
Given the center coordinates and radius of two circles, the intersection area of two circles is calculated and output. If it is circumscribed or not intersected, 0 is output, and the function value ACOS (- 1) is taken as the circumference ratio.
###Input format:
Enter six integers x1, Y1, R1, X2, Y2, R2 to represent the center (x1, Y1), (X2, Y2) and radius R1, R2 of the two circles respectively.
###Output format:
According to the position relationship of the circle, output the area of its intersection part (keep 2 decimal places).
###Input example:
Two sets of inputs are given here. For example:
```in
0 0 1 2 2 1
```
```in
2 0 2 5 2 3
```
###Output example:
The corresponding output is given here. For example:
```out
zero
```
```out
three point two two
```
answer：If there is no answer, please comment
###Input format:
Enter six integers x1, Y1, R1, X2, Y2, R2 to represent the center (x1, Y1), (X2, Y2) and radius R1, R2 of the two circles respectively.
###Output format:
According to the position relationship of the circle, output the area of its intersection part (keep 2 decimal places).
###Input example:
Two sets of inputs are given here. For example:
```in
0 0 1 2 2 1
```
```in
2 0 2 5 2 3
```
###Output example:
The corresponding output is given here. For example:
```out
zero
```
```out
three point two two
```
answer：If there is no answer, please comment