# Category: Geometry

### Compound Measures – Density (Mass/Volume)

Next on the compound measures is Density. This measure give you the mass of the material PER UNIT OF VOLUME. In terms of formula for the density, we use the. read more…

### Compound Measures – Speed (Distance/Time)

Speed is probably the easiest of the 3 compound measures to understand (the other 2 compound measures are Density and Force). We all know about the speed of cars for. read more…

### Surface Area of Solid Shapes

A reference page showing the formulas of the surface area of some common basic and composite shapes, including: Rectangular Prism Triangular Prism Pyramid Cone Sphere Cylinder Composite shape – Cylinder. read more…

### 3D Shapes

Below are the most common 3D shapes you will come across and with 3D shapes, you need to be able to work out the volume of these shapes. In a. read more…

### Trig Ratios – Must Know Values

There are many ways that allow you to work out the values for the trigonometric ratios of the most common angles (0°, 30°, 45°, 60°, and 90° ). Here is. read more…

### Trigonometric Ratios (Sine / Cosine / Tangent)

You use the trigonometric ratios when you are given a side and an angle in a right angle triangle and are asked to find a missing side. Note: Which ratio. read more…

### Circle Theorems (I – III)

Circle theorems are a set or rules you can use to arrive at the correct value of angles in a circle. In this article we will look at theorems 1. read more…

### Similar Shapes – Area & Volume

Calculating the area or volume of similar shapes relies on two very simple formulae you need to know. These are the ‘Area Scale Factor (Area SF)’ and the ‘Volume Scale. read more…

### Find a missing angle – non right angle triangle

For non right angle triangles, finding a missing angle requires the use of either the sine rule of the cosine rule. Which one to use will depend on what information. read more…