Rules of geometry

Geometric rules for the angles in a triangle, quadrilateral, line and point.

Parallel lines

Angles around parallel lines. Alternate, allied and corresponding angles.


Names of all regular polygons up to 10 sides, and a number of other special polygons.

Polygon angles

The interior and exterior angles of general and regular polygons.

Circle geometry

The nine circle theorems in 3 minutes.


Line and rotational symmetry of standard polygons.


Tessellations - which regular polygons tessellate and which do not.

Transformations (1)

Describing translations and rotations in the x, y plane.

Similar and congruent shapes

Similar and congruent shapes, special cases for triangles.


Four standard loci, loci which define regions, loci with more than one rule.