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**

More in this topic

1 2D add and subtract

2 2D add and subtract 2

3 3D add and subtract

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5 Multiplication by a scalar 2

6 Distance between two points

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15 Intersecting lines

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20 Angle between vectors 2

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22 Angle between 2D lines 2

23 Angle between 3D lines

24 Area of a triangle

25 Area of a triangle 2

26 Perpendicular vectors

27 Perpendicular vectors 2

28 Perpendicular vectors 3

29 Perpendicular vectors 4

30 Perpendicular lines

31 Perpendicular lines 2

32 Foot of perpendicular

33 Collinear points

34 Memorise the formulae

35 Diagonals of a parallelogram

36 Extended problem 1

37 Extended problem 2

38 Sequence O-test

39 O-test 1

40 O-test 2

41 O-test 3

42 O-test 4

43 O-test 5

44 O-test 6

45 O-test 7

46 O-test 8

47 Exam O-test 1

48 Exam O-test 2

49 Exam O-test 3

50 Exam O-test 4

51 Exam O-test 5

52 Exam timed O-test

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