# Homework Help: Buffon's cross

1. Dec 14, 2012

### hedipaldi

1. The problem statement, all variables and given/known data

The problem is Q2 in the attached

2. Relevant equations

3. The attempt at a solution
I am trying to determine the rigion of parameters for each number of crosses,where x and y are the distances of the center of cross from the closest line respectively,and θ is the acute angle.I need some help with this.My problem is in determining the geometric restrictions for each number of intersections,rather than the probability computatons.

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Last edited: Dec 14, 2012
2. Dec 14, 2012

### haruspex

Can the cross intersect more than one line?

3. Dec 15, 2012

### hedipaldi

Yes,it can.

Last edited: Dec 15, 2012
4. Dec 15, 2012

### haruspex

I intended that as a rhetorical question. The cross is two unit-length needles joined at their mid-points; the lines are unit distance apart. The cross can intersect the same line with both needles, but I fail to see how it can intersect two lines.