Maths Non-Calc. Facts & Formulas

Some facts and formulas for shapes and lines.

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  • Created by: Melina
  • Created on: 06-06-10 13:04

LCM and HCF

LCM - Lowest Common Multiple

  • Smallest Number that
  • Divides by
  • All Numbers in question

HCF - Highest Common Factor

  • Biggest Number that
  • Divides into
  • All Numbers in question
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Recurring Decimal to Fraction

Step-by-Step Example:

  • Call your original recurring decimal, x
  • x = 0.232323...
  • Times by 100
  • 100x = 23.232323...
  • Minus x from 100x
  • 99x = 23
  • To get x, devide both sides by 99
  • x = 23/99
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Sine & Cosine Rules

Cosine Rule: a² = b² + c² - 2bc cos C

  • Used with visible 3 sides, no angles OR
  • 2 sides, 1 enclosed angle
  • 

Sine Rule: a/sinA = b/sinB = c/sinC

  • Used with visible 2 angles, 1 side OR
  • 2 sides, 1 closed angle
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Areas and Volumes

Trapezium

  • Area = ½(a + b)h

Parallelogram

  • Area = b x h

Cylinder

  • Surface Area = 2πr(l+r)
  • Area of curved surface = πrl
  • Volume = πr²l

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