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

## Software/Applets used on this page

This page uses

jsMathYou 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**

More in this topic

1 Magnitude 4

2 2D add and subtract

3 Distance between two points

4 Intersection with a circle

5 2D add and subtract 2

6 3D add and subtract

7 Multiplication by a scalar 2

8 Sequence O-test

9 Unit vectors 2

10 Unit vectors

11 The section formula

12 Unit vectors 3

13 Equations of lines 2

14 Equations of lines

15 Equations of lines 3

16 Equations of lines 4

17 Equations of lines 5

18 Intersecting lines

19 Area of a triangle

20 Area of a triangle 2

21 Vector to cartesian form

22 Scalar product

23 Angle between vectors

24 Angle between vectors 2

25 O-test 1

26 O-test 2

27 Angle between 2D lines

28 Angle between 2D lines 2

29 Angle between 3D lines

30 Foot of perpendicular

31 Perpendicular vectors

32 Perpendicular vectors 2

33 Perpendicular vectors 3

34 Perpendicular vectors 4

35 Perpendicular lines

36 Perpendicular lines 2

37 O-test 3

38 O-test 4

39 Collinear points

40 O-test 5

41 Memorise the formulae

42 Diagonals of a parallelogram

43 Extended problem 1

44 Extended problem 2

45 O-test 6

46 O-test 7

47 O-test 8

48 Exam O-test 1

49 Exam O-test 2

50 Exam O-test 3

51 Exam O-test 4

52 Exam O-test 5

53 Exam timed O-test

54 Exam Question 2000

55 Exam Question 2000

56 Exam Question 2000

57 Exam Question 2002

58 Exam Question 2003

59 Exam Question 2003

60 Exam Question 2004

61 Exam Question 2005

62 Exam Question 2005

63 Exam Question 2006

64 Exam Question 2006

65 Exam Question 2006

66 Exam Question 2006

67 Exam Question 2007

68 Exam Question 2007

69 Exam Question 2007

70 Exam Question 2007

71 Exam Question 2008

72 Exam Question 2008

73 Exam Question 2008

74 Exam Question 2008

75 Exam Question 2008

76 Exam Question 2008

77 Exam Question 2008

78 Exam Question 2008

79 Exam Question 2008

80 Exam Question 2008

81 Exam Question 2008

82 Exam Question 2009

83 Exam Question 2009

84 Exam Question 2009

85 Exam Question 2009

86 Exam Question 2009

87 Exam Question 2009

88 Exam Question 2010

89 Exam Question 2011

90 Exam Question 2014