Cyclic quads

Author:Stephen Sproule

CDEF is a cyclic quadrilateral Move point C to find a relationship between angles D and F. (You may need to study this for a while.) By moving point C does the relationship between angles C and E change?

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αθροισμα γωνιων τριγωνου αποδειξη 2
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WEKSTEIN_ Midpoint quadrilaterals (part 1)

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Area
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