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The area of the triangle whose vertic...

The area of the triangle whose vertices are
`A(1,-1,2),B(2,1-1)C(3,-1,2)` is …….

A

13

B

`sqrt(13)`

C

21

D

none of these

Text Solution

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The correct Answer is:
B
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FIITJEE-MATHEMATICS TIPS-ASSIGNMENT (SECTION (I) : MCQ (SINGLE CORRECT)
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  2. Find a unit vector perpendicular to the plane determined by the poi...

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  3. The area of the triangle whose vertices are A(1,-1,2),B(2,1-1)C(3...

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  4. If bar(A(1))bar(B) and bar( C ) are three non-coplanar voctors, then (...

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  5. If vecA = (1, 1, 1), vecC = (0,1,-1) are given vectors, then prove tha...

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  6. Let veca=a(1)hati+a(2)hatj+a(3)hatk, vecb=b(1)hati+b(2)hatj+b(3)hatk a...

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  7. The vector vec a has the components 2p and 1 w.r.t. a rectangular ...

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  8. If the vectors ahati+hatj+hatk, hati+bhatj+hatk, hati+hatj+chatk(a!=1,...

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  9. let vec b = 4 hat i + 3 hat jLet vec c be a vector perpendicular to ve...

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  10. If vec xa n d vec y are two non-collinear vectors and a, b, and c ...

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  11. If a makes the same angle alpha, with the lines vec( r )=lambda(hati+h...

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  12. A plane meets the coordinate axes at A, B, C such that the centroid of...

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  13. The direction cosines of two lines are related by l + m + n = 0 and al...

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  14. Projection of the line x+y+z-3=0=2x+3y+4z-6 on the plane z=0 is

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  15. The distance of the point (1,-2,3) from the plane x-y+z=5 measured par...

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  16. (l(1),m(1),n(1)),(l(2),m(2),n(2)),(l(3),m(3),n(3)) are the direction c...

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  17. A plane a constant distance p from the origin meets the coordinate axe...

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  18. The equations to the straight line through (a, b, c) parallel to the z...

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  19. if the lines (x-1)/2=(y-1)/3=(z-1)/4 and (x-3)/2=(y-k)/1=z/1 intersect...

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  20. The shortest distance between a diagonal of a cube, of edge-length one...

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