Cd photography Baotou

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

∫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 recommend it for you: f.context ('cmsright', [{' URL ':/activity/knowledge? page key = l 6 ppxszt- 1 & CD version = 0. 1. 18 '，' src ':'/b 80 14 a90f 603738 db 886 dab fa 1 1bb 05 1f 9 19 ec5b？ 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 ':' '，}])； 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? Is Huaqiang North's second-hand mobile phone reliable? Baidu legal pro-free legal service recommends super 3w professional lawyers, 24-hour online service, with an average of 3 minutes to reply to free appointments. Online lawyers guide professional lawyers to complete one-on-one communication at any time, waiting for your answer? Change and help more people? Download Baidu Know APP and grab a fresh experience. Know the APP with Baidu and grab a fresh experience immediately. There may be answers that others want to know in the camera of your mobile phone. Scan QR code to download illegal and harmful information about personal and corporate infringement complaints. Please select and submit a category below.

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