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The process of the problem on page 39 17 in the first volume of the eighth grade of Su Ke Edition should be detailed.
Because PM=AM

So you can use 5 * 5+BM * BM = (12-BM) * (12-BM) to calculate BM and PM.

Simply prove that all three triangles in the diagram are similar triangles, and you can calculate D'N, PD' = AD = 12.

Knowing the three sides of a right-angled trapezoid, it is not difficult to find the other side, is it?

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