Analysis: Take A as the coordinate of the original 526 1 point, and the straight line 4 102 where AB and AC are located as the X axis and Y axis, respectively, and construct the rectangular coordinate system of 1653 to get the coordinates of B and C, then express the coordinates of PA as m, get the value of M with the formula of AP = 9, and then classify to get the coordinates of D.

Solution: Take A as the coordinate origin and straight lines of AB and AC as the X axis and Y axis, respectively, to establish a plane rectangular coordinate system, and then B (4 4,0), C (0 0,3),

Extended data

Today, the 2020 national college entrance examination ended in more than 20 provinces. On the 9th, the college entrance examination in most provinces in China has officially ended, and five provinces, including Beijing, Tianjin, Zhejiang, Hainan and Shandong, will also end all the examinations on 10, which means that the national college entrance examination in 2020 will come to an end.

By the evening of the 9th, at least 20 provinces including Beijing, Shanghai, Shandong, Hubei, Jilin, Qinghai, Hunan, Gansu, Chongqing, Jiangxi and Sichuan had announced the counting time, mainly from July 23rd to 26th.

Such as Jiangxi, Guangxi, Hubei, Gansu, Sichuan, Inner Mongolia, Shanghai and other provinces, the inspection time is July 23rd. Qinghai, Beijing and Henan are on July 25th. In addition, some provinces have given approximate time ranges. For example, Hunan's results will be released before July 25th. The announcement time of Hebei and Yunnan provinces is around July 23; Fujian is around July 24th.

China News Network-The 2020 college entrance examination will all end today. Please keep this "post-exam reminder" well!