Analyzing The Formula of A Parallelogram & Trapezoid

Areas of Trapezoids

Work Time

Areas of Trapezoids

The formula for the area of a trapezoid is:
area = 12(base 1 + base 2) • height, or A = 12(b1 + b2)h

Use the Trapezoid interactive to explore the area of a trapezoid. Move the vertices of the trapezoid and explore what happens to the area.

  • What happens if you keep the height constant and change one of the bases?
  • What happens if you keep the bases constant and change the height?
  • What happens if you keep the height and bases constant and change one of the angles?

INTERACTIVE: Trapezoid