∴∠B=∠C=45。
∠∠ 1 = 180-∠EPF-∠3，∠ EPF = 45，∠ C+∠ 2+∠ 3 = 65438+。
∴∠ 1= 135 -∠3,∠2= 135 -∠3,
∴∠ 1=∠2,
∴△BPE∽△CFP.
(2) As shown in the figure, ∫in△ABC, AB=AC=2, ∠ A = 90, and P is the midpoint of BC.
∴BP=CP=2.
If △BPE∽△CFP is known from (1), then BPCF=BECP, that is, 2CF=x2.
Solution, cf = 2x.
Then S△PEF=S△ABC-S△BPE-S△PFC-S△AEF.
= 12×2×2- 12×2x×sin b- 12×2×2x×sinC- 12×(2-x)×(2-2x)
=2- I have already praised it and stepped on it. What is your evaluation of this answer? Put away comments//high quality or satisfaction or special types or recommended answers dottimewindow.iperformance & window.iperformance.mark ('c _ best',+newdate); Lawyer recommendation service: If your problem has not been solved, please describe your problem in detail, and make free professional consultation on other similar problems through Baidu Law Pro 2023-03- 1 19. As shown in the figure, in +ABC+, +ACB=90, +F is the midpoint of AB, and D is the point above AB, with CD, CF and+. Jindong district simulation) as shown in the figure, in △ ABC, AB=AC, D and E are points on the side of BC, connecting AD and AE, and taking the straight line of AE on the side of △ADE as the pair 282011-05-13 as shown in the figure 14-29①. PE⊥AC is at point e, PF2520 18-02-22. As shown in the figure, at Rt△ABC, ∠ BAC = 90, AB=3, AC=4, point P is a moving point on the side of BC, point PE⊥AB is at point E, point PF ⊥. Point P is a fixed point on the side of BC (BP < CP), and B.C is defined as E and CF in F. P is the moving point on AB (P does not coincide with A and B) 3520 1 1-08-29. △ABC is known that ∠ C = 90, AC = BC, D is the midpoint of AB, P is the moving point on straight line AB, and PE⊥AC is in E and PF. As shown in the figure, in △ABC, AB=AC=2, ∠ A = 90, P is the midpoint of BC, and E and F3 are similar problems? & gt recommended for you: F.context('cmsRight', [{'URL':'/d01373f082025aaf511aa256e9edab64034f1a07? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId':'A24KA00562 '，}，{ ' URL ':/s？ word = % E6 % AC % A7 % E6 % B4 % B2 % E6 % 9D % AF & sa = searchpromo _ ozb _ zhidao _ tuijian '，' src ':'/3 BF 33 a 87 e 950352 AAF 5 df 4954 143 fbf2b 2 1 18 b6b？ x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId ':' '，}])； The price of electric cars has dropped many times. Is the quality guaranteed? What impact will the "network toilet" have? Is Huaqiang North's second-hand mobile phone reliable? Why is the cost of cancer treatment getting higher and higher? I recommend f.context ('recbrand', [{"img": "\/86D6277F9E2F07083523F69DFB 24B 899A901F20d? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto "，" url":"/hm.js？ 6859 ce 5a af 00 FB 00387 e 6434 E4 FCC 925 "； var s = document . getelementsbytagname(" script ")[0]； s.parentNode.insertBefore(hm，s)； })(); window . TT = 17 19974985；