Hello Codeforces,

Recently I decided to start learning geometry so I found out that I have to start with the simple geometry, basic shapes, basic laws and cakewalk problems to set off my journey with geometry and computational geometry then, so I came across this problem from the gym,

Given a circle (the center of the circle **|x|,|y| <= 1000,** and the radius **r <= 10000**) .

Given a rectangle (the coordinates of the **bottom-left** corner and the **upper-right** corner, **|x|,|y| <= 1000** as well) .

It's guaranteed that the upper-left corner of the rectangle is inside the circle, the width and the height of the rectangle are longer than **2.r** .

you're to calculate the area of the intersection between the circle and the rectangle .

Here's what I did :

- Obtain the two lines **P2-P3** let's say **L1** and **P2-P1** let's say **L2** .

- Find the points of the intersection between the lines **L1,L2** and the the circle, They're **CL1**, **CL2** .

- Compute the angle **(CL1 C CL2)** **theta** .

- Compute the area of the circular sector determined by theta, say **A** .

- Subtract the area of the triangle **(CL1 C CL2)** from **A** .

- Add the area of the triangle **(CL1 P2 CL2)** to **A** and **A** is the answer .

So I keep getting WA for the couple past days. Since it's being the first time I write a geometry code I know it'd be so buggy and really it was, I've been debugging it for hours and I re-wrote it several times, and eventually I had no thing to do with it, I badly ran out of my shots :(

Here's my code .

It would be really appreciated if someone tells me what's going wrong (maybe it's my algorithm though, Now I doubt it's absolutely correct) Thanks in advance .

**By the way, any advice, references, and problems would help a noob to kick-off in geometry would be highly appreciated as well .**