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The above shows a rectangle ABCDABCDABCD with an area of 672, a diagonal CBCBCB of length 42. Given that AE⊥CBAE \perp CB AE⊥CB and DF⊥CBDF \perp CBDF⊥CB, find CECECE.
Give your answer to 1 decimal place.
You may use a calculator for the final step of your calculation.
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