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The distance between two points in 3 dimensions is found by the formula:
d^2=(x_1-x_2)^2+(y_1-y_2)^2+(z_1-z_2)^2 You can get a better display of the maths by downloading special TeX fonts from jsMath. In the meantime, we will do the best we can with the fonts you have, but it may not be pretty and some equations may not be rendered correctly.

## Glossary

### union

The union of two sets A and B is the set containing all the elements of A and B.

Full Glossary List

## This question appears in the following syllabi:

SyllabusModuleSectionTopicExam Year
AQA A-Level (UK - Pre-2017)C4VectorsVector algebra-
AQA A2 Maths 2017MechanicsKinematics3D Vectors-
AQA AS/A2 Maths 2017MechanicsKinematics3D Vectors-
CBSE XII (India)Vectors and 3-D GeometryVectorsTypes, equal, unit, parallel, collinear-
CCEA A-Level (NI)C4VectorsVector algebra-
CIE A-Level (UK)P1VectorsVector algebra-
Edexcel A-Level (UK - Pre-2017)C4VectorsVector algebra-
Edexcel A2 Maths 2017Pure MathsVectors3D Vectors-
Edexcel AS/A2 Maths 2017Pure MathsVectors3D Vectors-
I.B. Higher Level4VectorsVector algebra-
I.B. Standard Level4VectorsVector algebra-
Methods (UK)M4VectorsVector algebra-
OCR A-Level (UK - Pre-2017)C4VectorsVector algebra-
OCR A2 Maths 2017Pure MathsVectors3D Vectors-
OCR MEI A2 Maths 2017Pure MathsVectors3D Vectors-
OCR-MEI A-Level (UK - Pre-2017)C4VectorsVector algebra-
Pre-Calculus (US)E1VectorsVector algebra-
Pre-U A-Level (UK)6VectorsVector algebra-