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How to do 20 1 1 math problems for the senior high school entrance examination in Zaozhuang, Shandong 15? We need a detailed process to solve the problem, which is urgent, thank you!
Solution:? As shown in the figure:

Because the angle B=30 degrees and AB= 14,

So, AC=7

Starting from CB parallel to ED, angle CFA= angle D=45 degrees,

And through angle CAD= angle d,

Get: angle CFA= angle CAD,

Therefore, CF=AC=7.

The shaded part is:

( 1/2)xacccf

=( 1/2)X7X7

=49/2

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