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Why is the fill-in-the-blank question about the circle in the third grade mathematics CD=CE?
For OF⊥BC in F, from the vertical diameter theorem, FC=4.

According to Pythagorean theorem, OF=3.

Let CG⊥DE be in g,

According to Pythagorean Theorem, OG=4

Then DG= 1, AG=9, GE= 1.

△CGD?△CGE

CD=CE .

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