# Maths Key Words and Definitions

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INTERGER = all positive and negative numbers
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MEAN = another word for average
MODE = number that occurs the most often in a list
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RECIPROCAL = 1 over something 1/?
Pythagorus = a2 + b2 = c2 (2=squared)
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area of a sphere = pie x r squared
curved surface area of a cylinder = 2 x pie x r x height
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area of a right anle triangle = 1/2 (base x height)
surface area of a sphere = 4 x pie x r squared
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The 'and' rule in probability = TIMES
The 'or' rule in probability - ADD
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SOH-CAH-TOA = (sin) (cos) (tan)
Corresponding angles are equal - these are angles in a letter F
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Alternate angles are equal - these are angles in a letter Z
Supplementary angles add up to 180° - these are angles in a letter 'U' or 'C' (when the 'U' and the 'C' are made of three straight sides, of course
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Vertically opposite angles are equal. (This is when two straight lines cross)
angles on a tangent = 90 degrees
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## Other cards in this set

### Card 2

#### Front

MODE = number that occurs the most often in a list

#### Back

MEAN = another word for average

### Card 3

#### Front

Pythagorus = a2 + b2 = c2 (2=squared)

### Card 4

#### Front

curved surface area of a cylinder = 2 x pie x r x height

### Card 5

#### Front

surface area of a sphere = 4 x pie x r squared