Republic of Mathematics blog

Posts Tagged ‘circle

Why does a triangle have an area?

Posted by: Gary Ernest Davis on: February 23, 2011

In a lovely series of videos James Tanton clarifies the formula for the area of a plane triangle. Starting from some simple postulates, namely: area is additive over finitely many parts that do not overlap; congruent figures have equal area; a rectangle of length and width has area James shows that, if a triangle has […]