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Mathematics 19 Online
OpenStudy (anonymous):

If the line segment DE is a diameter of a circle with centre C, and F is any other point on the circle, prove that (in Euclidean geometry) angle DFE is a right angle.

OpenStudy (anonymous):

Construct FC, gives u a couple isosceles triangles in r and 180 on the diameter, the half of which is the sum of the angles at DFE.

OpenStudy (anonymous):

more info / proofs: http://en.wikipedia.org/wiki/Thales'_theorem

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