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20 1 1 how to do the 22 questions of mathematics in Shanxi senior high school entrance examination?
Because AB = 4 and BC = 2.

So the root number 3 of AC=2

So AD=AC=2 root number 3

So in the right triangle ABD, BD=2 and the root number is 7.

So AD times AB=AE times BD (triangles have equal areas) and then 4x2 root number 3=AEx2 root number 7.

Just solve it.