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The answers to five questions on page 109 of the eighth grade mathematics book published by People's Education Press.
It is deduced from ∠ 1=∠C and ∠C+∠D= 180 that ∠ 1+∠D= 180 AE parallel DC is a parallelogram.

So AE=DC, AD=EC, △ABE circumference =29-(AD+EC)=29-(5+5)= 19.

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