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Q.

In △ABC if AB=2,AC=20,B=(3,2,0) and C=(0,1,4) then the length of the median passing through A is

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a

32

b

92

c

32

d

32

answer is C.

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Detailed Solution

AB=2,AC=20,B=(3,2,0) and C=(0,1,4) Now BC=26 ∴length of the median through A=122b2+2c2-a2                                                              =32
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In △ABC if AB=2,AC=20,B=(3,2,0) and C=(0,1,4) then the length of the median passing through A is