Search
Google ClassroomGoogle Classroom
GeoGebraGeoGebra Classroom
GeoGebra
  • Home
  • Resources
  • Profile
  • Classroom
  • App Downloads

Area of a Trapezoid by Similarity

Author:John Golden
Topic:Area, Trapezoid
Inspired by Ed Southall's trapezoid musings. http://solvemymaths.com/2015/03/07/proof-area-of-a-trapezium-trapezoid-us/ In the sketch, it is set up so BC<=AD. Is that an okay assumption to make?

New Resources

  • Right Triangle Inscribed in a Semicircle
  • Slope Illustrator (2)
  • What Do You See? (2)
  • Congruent Sides & Angles in △s: Exploration
  • Perpendicular Lines: Quick Exploration

Discover Resources

  • Non uniform linear motion with constant acceleration
  • Triangle3
  • Exterior Angles (Revisited) V2
  • Length of a circle
  • Finding the ratio x : y given algebraic equation ax + by = cx + dy

Discover Topics

  • Continuity
  • Circle
  • Integral Calculus
  • Standard Deviation
  • Dilation
AboutPartnersHelp Center
Terms of ServicePrivacyLicense
Graphing CalculatorCalculator SuiteMath Resources

Download our apps here:

Download_on_the_App_Store_Badge_US-UK_RGB_blk_4SVG_092917

© 2026 GeoGebra®