Geometry

similar triangles example

Similar Triangles and Similar Shapes

Similar shapes are exactly the same shape...but can be different sizes. This means all their angles must be the same and their sides proportional to each other....
side side side

Congruent Triangles

Congruent shapes are the same in size and shape....however they might be rotated or reflected. Proving Triangles Are CongruentIf asked to prove triangles are...
reflection example

Transformations

TranslationsWith a translation you just move all the points that make up a shape. Usually a translation is written like this: All you do is move each point x...
The angle at the centre of a circle is double that at the circumference

Circle Geometry

There are more rules about a circle than you would expect. Learn them all though and you'll be able to outfox the examiner. A Tangent And A Radius Meet At 90...
angles around a point

Basic Rules

If you can learn the following rules then you're life is going to a lot easier....well....at least during your maths exam. Angles In A Triangle Add Up To 180...
parallel lines

Parallel Lines

Parallel lines are always the same distance apart ("equidistant") and will never meet. Examiners love to throw in a question or two about them. Angles Around...
interior and exterior angles

Polygons

A polygon is just a "many sided shape". A regular polygon is one where all the angles and sides are the same (if they are different you have an irregular polygo...
symmetry

Symmetry and Tessellations

There are a few type of symmetry your might need to know about. Line SymmetryThis is really easy. You just draw a dotted line along where a shape will fold e...