Year 10 to University
Geometry Index

Geometry (Plane)
Area Calculator
Area of Circle, Triangle, Square, Rectangle, Parallelogram, Trapezium, Ellipse and Sector
Area of Irregular Polygons
Geometry - Reflection
Geometry Translation
Point Symmetry
Reflection Symmetry
3, 4, 5 Triangle
Activity: Garden Area
Alternate Exterior Angles
Alternate Interior Angles
Angle Bisector Construction
Center of Circle Construction
Circle Sector and Segment
Circle Theorems
Circle touching 3 Points Construction
Circumscribe a Circle in a Triangle Construction
Congruent Triangles
Consecutive Interior Angles
Constructing A Triangle With 3 Known Sides
Corresponding Angles
Cut a line into N segments Construction
Definition of Arc
Definition of Chord
Definition of Compass (Drawing)
Definition of Congruent
Definition of Contruction (Geometry)
Definition of Isosceles Triangle
Definition of Locus
Definition of Parallel
Definition of Parallelogram
Definition of Perpendicular
Definition of Radian
Definition of Rectangle
Definition of Rhombus
Definition of Similar
Definition of Square
Definition of Tangent (line)
Definition of Trapezoid
Diagonals of Polygons
Double Hearts Ratio
Equilateral Triangle OR 60 degree angle Construction
Exterior Angles of Polygons
Geometry Resizing
Geometry Rotation
How To Find if Triangles are Similar
Inscribe a Circle in a Triangle Construction
Interactive Quadrilaterals
Interior Angles of Polygons
Line Bisector Construction
Parallel Line through a Point Construction
Parallel Lines, and Pairs of Angles
Pentagon Construction
Perpendicular to a Point NOT on a Line Construction
Perpendicular to a Point on a Line Construction
Point to Tangents on a Circle Construction
Quadrilaterals - Square, Rectangle, Rhombus, Trapezoid, Parallelogram
Regular Polygons - Properties
Rotational Symmetry
Set of All Points
Similar Triangles
Symmetry - Reflection and Rotation
The Pentagram
Theorems about Similar Triangles
Triangles - Equilateral, Isosceles and Scalene
Triangles Contain 180 Degrees
Using a Ruler and Drafting Triangle
What is a Plane?
Geometry (Solid)
Area of Circle, Triangle, Square, Rectangle, Parallelogram, Trapezium, Ellipse and Sector
Equations and Formulas
Perpendicular and Parallel
Pouring Liquid
Activity: Investigating Solids
Activity: Soup Can
Cross Sections
Cuboids, Rectangular Prisms and Cubes
Definition of Cylinder
Dihedral Angle Calculator
Euler's Formula
Parallel and Perpendicular Lines and Planes
Platonic Solids
Platonic Solids - Why Five?
Prisms with Examples
Spinning Cone
Spinning Cube (Hexahedron)
Spinning Cylinder
Spinning Dodecahedron
Spinning Icosahedron
Spinning Octahedron
Spinning Pentagonal Pyramid
Spinning Square Pyramid
Spinning Tetrahedron
Unfold the Prism Puzzle
Vertices, Edges and Faces
Volume of a Cuboid


And there is also the Illustrated Math Dictionary, Worksheets, Games, Puzzles and Forum.