摘要：
Problem Description Doctor D. are researching for a horrific weapon. The muzzle of the weapon is a circle. When it fires, rays form a cylinder that runs through the circle verticality in both side. If one cylinder of rays touch another, there will be an horrific explosion. Originally, all circles c. 阅读全文
摘要：
DescriptionRecently in Farland, a country in Asia, a famous scientist Mr. Log Archeo has discovered ancient pyramids. But unlike those in Egypt and Central America, they have triangular (not rectangular) foundation. That is, they are tetrahedrons in mathematical sense. In order to find out some impo 阅读全文
摘要：
DescriptionUpdog is watching a plane object with a telescope. The field of vision in the telescope can be described as a circle. The center is at the origin and the radius isR. The object can be seen as a simple polygon ofNvertexes. Updog wants to know the area of the part of the object that can be 阅读全文