http://img69.imageshack.us/img69/5044/imagemta.jpg

Hypothesis: AC = CB

DE is the diameter

CH is perpendicular to AB (the altitude)

Thesis: DE : BC = BC : CH (BC^2 = DE * CH)

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- September 6th 2011, 01:21 AMgobyProof: An Isosceles Triangle inscribed in a Circle
http://img69.imageshack.us/img69/5044/imagemta.jpg

Hypothesis: AC = CB

DE is the diameter

CH is perpendicular to AB (the altitude)

Thesis: DE : BC = BC : CH (BC^2 = DE * CH) - September 6th 2011, 01:46 AMalexmahoneRe: Proof: An Isosceles Triangle inscribed in a Circle
- September 6th 2011, 02:19 AMgobyRe: Proof: An Isosceles Triangle inscribed in a Circle
Okay, I understood it, but what's the proof for R = http://mathworld.wolfram.com/images/...s/Inline22.gif?

- September 6th 2011, 02:25 AMalexmahoneRe: Proof: An Isosceles Triangle inscribed in a Circle