On 30-60-90 and 45-90-45 Triangles (TANTON Mathematics) @DrJamesTanton
On 30-60-90 and 45-90-45 Triangles (TANTON Mathematics) @DrJamesTanton
Uploaded January 2010 | Updated September 2026, 3 weeks ago
A standard geometry course makes kids memorise the ratios of "special' triangles. I am not sure why. Here's what these triangles really are and how, as a mathematician, one can think your way through them. (Not they they ever really arise in a serious way in mathemaical work!)
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On 30-60-90 and 45-90-45 Triangles (TANTON Mathematics)

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