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How to do the mathematical triangle problem of Quanzhou three-level quality inspection?
(2) CD and BG are vertically bisected by the symmetry axis EF,

So CD∨BG,

So CD/BG=CE/GE=CE/BE,

BC=√2 1，CE=2，∠C=90，

So BE=5, CG=CE+BE=7,

BG=√(49+2 1)=√70，

So CD=CE*BG/BE=2√70/5.

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