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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
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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-
CCEA A-Level (NI)C4VectorsVector algebra-
Edexcel A-Level (UK - Pre-2017)C4VectorsVector algebra-
I.B. Higher Level4VectorsVector algebra-
I.B. Standard Level4VectorsVector algebra-
OCR A-Level (UK - Pre-2017)C4VectorsVector algebra-
OCR-MEI A-Level (UK - Pre-2017)C4VectorsVector algebra-
Scottish HighersM3VectorsVector algebra-
WJEC A-Level (Wales)C4VectorsVector algebra-
Methods (UK)M4VectorsVector algebra-
CIE A-Level (UK)P1VectorsVector algebra-
Pre-U A-Level (UK)6VectorsVector algebra-
Scottish (Highers + Advanced)HM3VectorsVector algebra-
Pre-Calculus (US)E1VectorsVector algebra-
Universal (all site questions)VVectorsVector algebra-
CBSE XII (India)Vectors and 3-D GeometryVectorsTypes, equal, unit, parallel, collinear-
Edexcel A2 Maths 2017Pure MathsVectors3D Vectors-
AQA A2 Maths 2017MechanicsKinematics3D Vectors-
OCR A2 Maths 2017Pure MathsVectors3D Vectors-
OCR MEI A2 Maths 2017Pure MathsVectors3D Vectors-
Edexcel AS/A2 Maths 2017Pure MathsVectors3D Vectors-
AQA AS/A2 Maths 2017MechanicsKinematics3D Vectors-