Current location - Training Enrollment Network - Mathematics courses - The process of the problem on page 39 17 in the first volume of the eighth grade of Su Ke Edition should be detailed.
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?