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**

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5 2D add and subtract 2

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32 Perpendicular vectors 2

33 Perpendicular vectors 3

34 Perpendicular vectors 4

35 Perpendicular lines

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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

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