Euler characteristic

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	Topic	Category	Replies	Date
	Into how many parts do two quadrilaterals divide the plane,if (a) they are convex (b) they are not necessarily convex	Question	0	10/9/2009
	On a circular island we build n straight dams going from sea to sea, so that every two intersect but no three go through the same point. use Eulers Fo...	Question	0	10/9/2009