Length, Area, Volume

• Area
  • Area (A = l × w)
  • Measured in square units. (in², m², ...)
  • Notice 1m² ≠ 10 cm²
  • A square 100m x 100m is 1 hectare or 1ha
  • 1ha ≈ 2.5 acres.
  • For a circle, A=πr²
• Volume
  • Volume (V = l×W×H)
  • measured in cubic units
  • 1m³≠ 10cm³
  • 1 liter = 1 dm³
  • 1 cm³ = 1 ml
  • 1 m³ = 1 kl
• For a cylinder V = πr²h

Mass and Temperature

• Mass is measured in grams.
• For water:
  • 1 cm³ = 1 ml = 1 g
  • 1 dm³ = 1 l = 1 kg
  • 1 m³ = 1 kl = 1000 kg = 1t (metric tonne)
• F = 9/5C + 32.
• C = 5/9(F-32)