Welcome to the Math Salamanders' Geometry Cheat Sheet area.

Here you will find a range of different Geometry quick reference sheets which will help you to answer a range of geometry questions.

Here you will find our online geometry support page about different Geometry formulas, including properties of angles, 2d and 3d shapes, as well as some common formulas to help you to work out area and volumes.

Using these sheets will help your child to:

- identify 2d shapes and know what special properties they have;
- identify a range of 3d shapes, and know how many faces, edges and vertices they have;
- know the common formulas for 2d shapes;
- know the formulas for working out the surface areas and volumes of a range of 3d shapes.

Here are our selection of geometry quick reference sheets for helping you learn your geometry facts.

Each cheat sheet contains facts and information about one aspect of geometry.

Most of the sheets have both a color and also a black and white version available.

Cheat Sheet 1 contains the following information about angles.

- types of angles: right, acute, obtuse, reflex;
- angles in a triangle;
- angles in a quadrilateral;
- angles at a point;
- interior angles of regular polygons.

There is a US and a UK version of this sheet due to the differences in some of the shapes.

Cheat Sheet 2 contains the following information about 2d shapes:

- types and properties of triangles;
- types and properties of quadrilaterals;
- properties of regular polygons;

Cheat Sheet 3 contains the following information about 3d shapes:

- types of 3d shapes;
- properties of 3d shapes: faces, edges and vertices.

Please note that there is some disagreement over the definitions and properties of 3d shapes.

Some mathematicians allow a face to be curved and some do not.

Some mathematicians allow an edge to be curved and some do not.

Cheat Sheet 4 contains a range of formulas about 2d shapes:

- angles in a triangle;
- pythagoras' theorem;
- basic trigonometry laws;
- formulas for the circumference and area of a circle;
- formula for the length of an arc and the area of a sector;
- formulas for the area of a range of quadrilaterals.

Cheat Sheet 5 contains a range of formulas about 3d shapes:

- surface area of a range of 3d shapes;
- volume of a range of 3d shapes.

Take a look at some more of our worksheets similar to these.

Here you will find a support page packed with a range of geometric formula.

Included in this page are formula for:

- areas and volumes of 2d and 3d shapes
- interior angles of polygons
- angles of 2d shapes
- triangle formulas and theorems

This page will provide a useful reference for anyone needing a geometric formula.

Here you will find a support page to help you understand some of the special features that triangles have, particularly right triangles.

Using this support page will help you to:

- understand the different types and properties of triangles;
- understand how to find the area of a triangle;
- know and use and apply Pythagoras' Theorem.

All the free printable geometry worksheets in this section support the Elementary Math Benchmarks.

Here you will find a List of different Geometric Shapes.

Included with each shape is a small picture and a description of the properties the shape has and how it relates to other shapes.

Included in this page are the following shapes:

- triangles
- quadrilaterals
- regular polygons
- irregular polygons
- a range of 3d shapes

All the printable Geometry worksheets in this section support the Elementary Math Benchmarks.

Here you will find our range of Free Nets for 3D Shapes.

The following printables contain nets of common 3D shapes that your child should know. Each net sheet is available both with and without tabs to aid sticking together.

Using these sheets will help your child to:

- know the properties of different 3d shapes;
- recognise different 2d shapes inside the 3d shapes;
- construct a 3d shape from a net;
- recognise 3d shapes in different orientations and sizes;
- experience the fun and wonder of creating a 3d shape from a net.

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