Traditional Culture Encyclopedia - Hotel accommodation - (20 1 1? Suzhou Second Model) In the triangular prism ABC-a1b1,the base △ABC is a right triangle, AC=BC=AA 1=2, and D is the midpoint of the side AA 1. ( 1

(20 1 1? Suzhou Second Model) In the triangular prism ABC-a1b1,the base △ABC is a right triangle, AC=BC=AA 1=2, and D is the midpoint of the side AA 1. ( 1

Solution: Solution: (1) As shown in the figure, a rectangular coordinate system is established with C as the origin and CA, CB, CC 1 as the coordinate axes.

C-xyz。

Then c (0 0,0,0), a (2 2,0,0), b (0 0,2,0), c1(0,0,2), b1(0 (0,2,2), d (2

So DC 1 = (-2,0,1), and b1c = (0,2,2).

So cos < dc 1, b 1c > = dc 1? b 1C | DC 1 | | b 1C | =? 25×8=- 10 10.

That is to say, the cosine of the angle formed by DC 1 and B 1C is10.

(2) Because CB = (0 0,2,0), CA = (2 2,0,0), CC1= (0,0,2),

So CB? CA=0,CB? CC 1=0,

So CB is the normal vector of plane ACC 1A 1.

Because I have 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 questions 2018-03-28 (2011? As shown in the figure, in triangular prism ABC-a1b1c1,AB=AC=AA 1=3a, BC=2a, D is the midpoint of BC, E is the midpoint of AB, and F is C22012-00. AB=5, AA 1=4, and point d is the midpoint of ab. Find the angle formed by the straight line AC 1 and b1C. 1220 17-09- 19(20 12? As shown in the figure, in the prism ABC-a1b1c1,AB=AC=5, BB 1=BC=6, D and e are the midpoint of AA 1 and B 1C respectively (1 in prism ABC-a1b1,angle BAC = 90, AB = AC = AA angle BCA=90. The edge aa1= 272013-1-29 as shown in the figure, in the straight triangular prism ABC-a1b1,the angle BAC=90 degrees. AB = E is the midpoint of BC14201-02-66, as shown in the figure. In the bottom triangle ABC of straight triangular prism ABC-A1b1kloc-0/,Ca = CB =/. 662011-08-21straight prism ABC-a1b1where ab = AC = 1 ∠ BAC = 90. & 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 ':' ',}]); 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 = 172097 1893;