formulas

• Area of a rectangle

  Length x width
• Area of a triangle

  1/2 x base x height
• Area of a parallelogram

  Base x height
• Area of a trapezium

  1/2 x (a + b) x height
• Area of a circle


  π x r²
• Circumference of a circle

  π x d or π x 2r
• Volume of a prism


  Area of cross-section x length
• Volume of a cylinder


  π x r² x height
• Pythagoras Theorem


  a² + b² = c²