In the July 2009 issue of Learning and Teaching Mathematics (see ), I described a proof without words of the area of a trapezium. Unfortunately, due to the given diagram being a special, symmetrical case rather than a general trapezium, some readers might have misinterpreted that the proof was only valid for an isosceles trapezium (see ). To clarify this point, we can refer to the visual proofs for two general trapeziums below. Copyright © 2012 Association for Mathematics Education of South Africa (AMESA).
|Journal||Learning and Teaching Mathematics|
|Publication status||Published - Jun 2012|