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Mathematics
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. Suppose that G is yet another point on the circle, such that FG passes through C. Prove that FE is parallel to DG.

OpenStudy (anonymous):

OG=OE and OF =OD and angles O1 = O2 two triangles have congruity. ( DOG and FOE). so DG=FE we can proof same congruity for tiangles DOF and GOE. so DF=GE

OpenStudy (anonymous):

so DGEF is parallelogram.

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