Constructions Explains how to construct circles, perpendicular lines, perpendicular bisectors, and midpoints. Gives very easy to follow instructions. Parallel Lines Gives different postulates and theorems for parallel lines. Also goes on to explain about transversals. This site includes the distance formula for different types of coordinates, and the midpoint formula.
Circles Gives the definitions of terms related to circles.
Also includes many formulas that relate to circles such as circumference, area, length of an arc, and length of a sector. Also includes a graph of the Unit Circle. Gives the area, volume, and surface area for practically every possible figure imaginable. A good lesson plan where students create scale drawings and calculate surface area and volume. A great lesson plan that teaches students the relationship between different geometrical shapes.