Free geometry tutorials on topics such as reflection, perpendicular bisector, central and inscribed angles, circumcircles, sine law and triangle properties to solve triangle problems. Also geometry problems with detailed solutions on triangles, polygons, parallelograms, trapezoids, pyramids and cones are included. Polar coordinates equations, conversion and graphing are also included. More challenging geometry problems are also included.
Geometry Problems

3D Shapes Volume Problems. 3D shapes, such as prisms, volume problems with detailed solutions.

Area Of Octagon  Problem With Solution. Find the length of one side, the perimeter and area of a regular octagon given the distance between two opposite sides (span).

Solve Right Triangle Given Perimeter and Area  Problem With Solution. Solve a right triangle given its perimeter and area. Detailed solution provided.

Two Squares and a Circle  Problem With Solution. A problem, with detailed solution, on a circle inscribed in one square and circumscribed to another, is presented.

Two Circles and a Square  Problem With Solution. A problem, with detailed solution, on a square inscribed in one circle and circumscribed to another is presented.

Triangle Inscribed in a Circle  Problem With Solution. Inscribed right triangle problem with detailed solution.

Similar Triangle Problems. We present several problems on similar triangles with detailed solutions.

Circle Tangent to Right Triangle  Problem With Solution. Solve a right triangle whose sides are all tangent to a circle. Both the problem and its detailed solution are presented.

congruent Triangle Problems. We present several problems on congruent triangles with detailed solutions.

Compare Volumes of 3D shapes. A problem to compare the volumes of a cone, a cylinder and a hemisphere.

How to construct a frustum?. If you cut off the top part of a cone with a plane perpendicular to the height of the cone, you obtain a conical frustum. How to construct a frustum given the radius of the base, the radius of the top and the height?

Parallelogram Problems. Word problems related to parallelograms are presented along with detailed solutions.

Cone Problems. Problems related to the surface area and volume of a cone with detailed solutions are presented.

Pyramid Problems. Pyramid problems related to surface area and volume with detailed solutions.

Trapezoid Problems. Trapezoid problems are presented along with detailed solutions.

Solve a Trapezoid Given its Bases and Legs.

Rhombus Problems. Rhombus definition and properties are presented along with problems with detailed solutions.

Rectangle Problems. Rectangle problems on area, dimensions, perimeter and diagonal with detailed solutions.

Geometry Problems on Squares. Square problems on area, diagonal and perimeter, with detailed solutions.

Polygons Problems. Problems related to regular polygons.

Parallel Lines and Angles Problems. Problems related to parallel lines and alternate and corresponding angles.

Overlapping Circles Problem. Find overlapping area of two circles: problem with detailed solutions.

Sectors and Circles Problems. Problems, with detailed solutions, related to sectors and circle.

Cosine Law Problems. The cosine law is used to solve word problems.

Sine Law Problems. The sine law is used to solve word problems.

Triangle Problems. Triangle problems with detailed solutions.
Challenge Geometry Problems
Geometry Tutorials

Simple Proofs of Pythagorean Theorem.

Triangles. Definitions and properties of triangles in geometry.

Inscribed and Central Angles in Circles. Definitions and theorems related to inscribed and central angles in circles are discussed using examples and problems.

Congruent Triangles Examples. Postulates and theorems on congruent triangles are discussed using examples.

Similar Triangles Examples. Definitions and theorems on similar triangles are discussed using examples.

Area of Triangles. tutorial is designed to explore the different formulas used to calculate the areas of triangles using an applet.

Parallel Lines and Angles. This tutorial is about the corresponding, interior and exterior angles formed when a tranversal line intersects two parallel lines.

Properties of Triangles. An applet is used to explore,interactively, the properties of triangles.

Thales' theorem. An applet is used to verify Thales' theorem: An angle inscribed in a semicircle is a right angle.

Regular Polygons. Tutorial to develop useful formulas for area of regular polygons.

Rotation Symmetry in Regular Polygons. An interactive tutorial to explore rotation symmetry of regular polygons and derive a formula for the angle of rotation.

Rotation Symmetry of Geometric Shapes. An interactive tutorial to explore rotation symmetry of geometric shapes.

Angles in Geometry. Definitions and properties of angles in geometry.

Sine law  ambiguous case  applet. The ambiguous case of the sine law, in solving triangle problems, is explored interactively using an applet.

Medians of Triangle  Interactive applet. The properties of the medians of a triangle are explored using an interactive geometry applet.

Central and Inscribed Angles  Interactive applet. The properties of central and inscribed angles intercepting a common arc in a circle are explored using an interactive geometry applet.

Perpendicular Bisector Interactive applet. The definition and properties of the perpendicular bisector are explored using a geometry applet.

Triangles, Bisectors and Circumcircles  interactive applet. The properties of perpendicular bisectors in triangles and circumcircles are explored interactively using a geometry java applet.

Table of Formulas for Geometry. A table of formulas for geometry, related to area and perimeter of triangles, rectangles, circles, sectors, and volume of sphere, cone, cylinder are presented.
Polar Coordinates
Geometric Transformations
Geometric Calculators and Worksheets 
