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10. Topology .
* Homotopic objects: two object such that one can be deformed into the other without cutting or gluing.
*Various (topological) objects we have encountered (and we saw how to get them).
* There are only 5 regular polyhedra (and we saw why that is true).
* There are many more (92 or so) convex polyhedra with sides made of (possibly distinct) regular polygons.
* Hyperbolic plane: what is it.
* "Lines" in the hyperbolic plane and how to construct them.
* Other constructions: parallel "lines", triangles, angles between "lines".
* (Regular) tilings of the hyperbolic plane - infinitely many such (since the sum of the angles in a hyperbolic triangle could be any angle between 0 and 180 degrees).
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* Homotopic objects: two object such that one can be deformed into the other without cutting or gluing.
*Various (topological) objects we have encountered (and we saw how to get them).
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