3D doubts

JEE Mains 2015 Sample Questions › 3D and Vectors questions › 3D doubts

Q) 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) âˆš2a
b)23a
c) 2âˆš5a
d) âˆš32a

#Mathematics #3D and Vectors

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106

Asish Mahapatra ·2010-02-07 21:51:50

question ra source??

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satyajeet ·2010-02-07 21:55:38

na re....given (B)....hw to get eqns or drs???

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106

Asish Mahapatra ·2010-02-07 21:57:47

assume that the center of the sq, is origin..

simplifies calculations...

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Manmay kumar Mohanty ·2010-02-10 23:22:50

Since 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.

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abhishek93 Singh ·2010-02-16 00:14:51

i guess b) is the correct

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Basic Integral Calculus Operators Symbols Matrix Cases

√ √ || {} [] () → ~ ^ x x x → → ln log lg lim lim cos sin tan cot arcsin arccos arctan

∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

+ - × ÷ ± ∓ = ∪ ∩ ≠ ∼ ≈ ∅ ∀ ∃ ∈ ∋ ∝ ≤ ≥ ≃ ≅ ≡ < > ≪ ≫ ⊂ ∉ ⊃ ⊆ ⊇ ⇒ ⇐ ⇔ ⇒ ⇐ ⇔ ⇑ ⇓ ⇕ → ← ↔ → ← ↔ ↑ ↓ ↕ ↖ ↗ ↘ ↙ ↪ ↩ ⇀ ↼ ⇁ ↽

° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω

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3D doubts

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