Exploring Pascal's Triangle: Lessons
This is a collection of patterns in Pascal's Triangle. Many relationships come out of the patterns in the triangle. Students can even use colors to identify patterns.

Perimeter Explorer
In this interactive lesson, students vary area and observe the new perimeter, looking for patterns.

Area Explorer
In this interactive lesson, students vary perimeter and observe the new area, looking for patterns.

Totally Tessellated
This site describes the symmetry of polygons and includes a table of data about the interior angles of polygons. There is a mistake in the sum of the interior angles of the 11 and 12-gons, but the idea of looking at the data is good. Notice the linear nature of the sum of the interior angles and the limiting nature of the individual angles.

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