The Buffon's Needle
Suppose we have a floor made of parallel strips of wood, each the same width, and we drop a needle onto the floor. What is the probability that the needle will lie across a line between two strips?
Details and Assumptions:
Assume that you drop a needle on your rough copy and you have to find the probability that it crosses one horizontal line .
Length of needle is equal to separation between two lines.
Plane of needle is parallel to plane of floor or you rough copy.