Revised math formulas

• Area of a square

  A=side x side
• Area of a rectangle

  A=length x width
• Area of a parallelogram

  A=base x height
• Area of a trapezoid

  (base1 + base2) x height / 2
• Area of a triangle

  A=1/2 x base x height
• Area of a circle

  A=3.14•r•r
• how to get circumference

  A=3.14 R