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#1 Posted 11:16am 08-02-10 3D doubtsQ) A Square ABCD of diagonal 2a is folded along the diagonal AC so that the planes DAC and BAC are at right angles. The shortest distance between DC and AB is a) √2a b)[frac]2[/]3[/frac]a c) [frac]2[/]√5[/frac]a d) [frac]√3[/]2[/frac]a |
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#2 Posted 11:21am 08-02-10 Re: 3D doubtsquestion ra source??
IIT has walked to me ... off to IIT K |
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#3 Posted 11:25am 08-02-10 Re: 3D doubtsna re....given (B)....hw to get eqns or drs??? |
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#4 Posted 11:27am 08-02-10 Re: 3D doubtsassume that the center of the sq, is origin.. simplifies calculations...
IIT has walked to me ... off to IIT K |
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#5 Posted 0:52pm 11-02-10 I thinkSince diagonal is given u can find out the side length and assuming on vertex to be at the origin U can find equations of lines.Please make sure that three faces of the square should be on xy, yz, xz planes. Then if u can use skew lines property. Please check in for the process.
In every loss, in every lie, in every truth that you'd deny
And each regret and each goodbye was a mistake too great to hide
And your voice was all I heard that I get what I deserve
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#6 Posted 1:44pm 16-02-10 Re: 3D doubtsi guess b) is the correct |
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