Online JudgeProblem SetAuthorsOnline ContestsUser
Web Board
F.A.Qs
Statistical Charts
Problems
Submit Problem
Online Status
Prob.ID:
Register
Authors ranklist
Current Contest
Past Contests
Scheduled Contests
Award Contest
Register
ACM-ICPC亚洲区预选赛(北京赛区)游戏对抗邀请赛​正在报名中

Language:
A Triangle and a Circle
 Time Limit: 5000MS Memory Limit: 131072K Total Submissions: 3170 Accepted: 734 Special Judge

Description

Given one triangle and one circle in the plane. Your task is to calculate the common area of these two figures.

Input

The input will contain several test cases. Each line of input describes a test case. Each test case consists of nine floating point numbers, x1, y1, x2, y2, x3, y3, x4, y4 and r, where (x1, y1), (x2, y2) and (x3, y3) are the three vertices of the triangle and (x4, y4) is the center of the circle and r is the radius. We guarantee the triangle and the circle are not degenerate.

Output

For each test case you should output one real number, which is the common area of the triangle and the circle, on a separate line. The result should be rounded to two decimal places.

Sample Input

`0 20 10 0 -10 0 0 0 10`

Sample Output

`144.35`

Source

[Submit]   [Go Back]   [Status]   [Discuss]