(20 14? As shown in the figure, straight triangular prism ABC-a1b1where AA 1=2AC=2BC, d is the midpoint of AA 1, and cd ⊥ b1d. (1) Proof:

(1) It is proved that the sides of straight triangular prism ABC-a1b1c1are rectangles.

∫d is the midpoint of AA 1, ∴DC=DC 1,

And aa1= 2a1,∴ dc 12+dc2 = cc 12,

∴CD⊥DC 1，

And CD⊥B 1D, B 1D∩C 1D=D,

∴CD⊥ plane B 1C 1D,

∵B 1C 1？ Aircraft B 1C 1D, ∴ CD ⊥ B 1C 1.

(2) Solution: We know that B 1c 1 ⊥ CD comes from (1), while b1c/⊥ c1c,

∴B 1C 1⊥ aircraft ACC 1A 1,

∴CA, CB, CC 1 are vertical,

With c as the origin and CA as the x axis, let AA 1=2AC=2BC=2,

Establish a spatial rectangular coordinate system,

Then a (1, 0,0), b 1 (0, 1, 2), c (0 0,0,0), d (1, 0,1),

∴ad=(0,0, 1),b 1d=( 1,- 1,- 1),dc=(- 1,0,- 1)，

Let the normal vector ADB 1 n = (x, y, z),

Then \ n? I 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 provide free professional consultation through Baidu Law Professional Edition. Other similar problems are 20 1 1-06-09 as shown in the figure. In AB=AC-A1b1,AB⊥AC, D and E are AA 1 and B respectively. A dihedral angle a-BD-c382016538AA 1 = 2, triangular prism ABC-A 1b 1c65438 from fixed point b along prism edge (via aa1) to vertex c/kloc. D is the midpoint of the bottom AB. E is the midpoint of CC 1. Verify that in the CD// plane A 1EB502020-05-02 regular triangular prism ABC-A1B1C1,bc=2, aa 1 = the square root of 6, and d.e are AA respectively. Baotou mode 2) As shown in the figure, in the prism ABC-a1b1c1,AA 1=2AC=2BC, D is the midpoint of AA 1, and CD ⊥ b/kloc-0. (1). In ABC ﹣ a1b1,AC=BC= 1/2AA 1, D is the midpoint of the edge AA 1. Gansu second model) as shown in the figure, in the straight triangular prism ABC-a1b1,AC⊥AB, AB = 2A 1, m is the midpoint of AB, and △ a/kloc/kloc-0. Gansu second model) as shown in the figure, in the straight triangular prism ABC = a1b1,AC⊥AB, AB = 2A 1, m is the midpoint of AB, and △ a/kloc1. & 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 ':/builder/bjh-activity/articlesTask？ taskId = 1598082 & aside = 0 & footer = true & from = 0 '，' src ':'/203 FB 80 e 7 bec 54 e 773 ea 0680 ab 389 b 504 fc 26 a2d？ x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId ':' '，}，{ ' 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 ':' '，}])； Is Huaqiang North's second-hand mobile phone reliable? Why is the cost of cancer treatment getting higher and higher? What impact will the "network toilet" have? The price of electric cars has dropped many times. Is the quality guaranteed? 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 = 1720695744；