Parallel Lines             Congruent Tri.             Congruent R. Tri.             Isosc. and Equil.             Quadrilaterals             Parallelograms             Ratios             Similar Polygons             Special Triangles            Circles             Area             Coordinate Geo.             Triangle Ineq.             Solids             Computer Fun

Welcome to the Geometry portion of the site!  On this and the following pages, we'll try to clear up some of the common problems people have with geometry (which seems to stump just about everyone who's ever taken it).  Everything from parallel lines to volumes of prisms and a couple of word problems are covered. After each section, there is an optional (though highly recommended) quiz that you can take to see if you've fully mastered the concepts.  Don't forget to visit the message board and the formula database. Click any of the links below to go to the section you need help with.  Parallel Lines Transversals How to tell if lines are parallel Using parallel lines to gather information about triangles Congruent Triangles  Side-Angle-Side Side-Side-Side Angle-Side-Angle Angle-Angle-Side Congruent parts (CPCTC) Congruent Right Triangles Leg-Leg Leg-Acute Angle Hypotenuse-Acute Angle Hypotenuse-Leg Isosceles and Equilateral Triangles Quadrilaterals Parallelograms How to tell if it is a parallelogram Ratios Similar Polygons Special conditions for triangles  Parallel intersections  Special Triangles Pythagorean theorem  45-45-90  30-60-90 Trigonometric ratios Story problems Circles Chords and radii Tangents Congruent arcs Inscribed angles Angles involving tangents and/or secants Segments in circles Circumference and arc length Area Rectangles Squares Triangles Parallelograms Rhombuses Trapezoids Circles and sectors Other polygons Coordinate Geometry Midpoint formula Slope Equations Distance formula Triangle Inequality Area and Volume of Solids Prism Area Prism Volume Pyramids Cylinders Cones Spheres And, for all you computer nerds our there, we've included a section full of short QBasic programs that do basic geometry problems.  Feel free to download them, use them, and improve them (they're freeware)! Computer Fun