Q.

Arrange the following areas in ascending order

A. Area of parallelogram with adjacent sides i¯+2j¯+3k¯, 3i¯-2j¯+k¯ is

B. Area of parallelogram with diagonals i¯+2j¯+3k¯, 3i¯-2j¯+k¯ is

C. Area of parallelogram with diagonals are 3i¯+j¯-2k¯, i¯-3j¯+4k¯ is

D. Area of parallelogram with adjacent sides 3i¯+j¯-2k¯, i¯-3j¯+4k¯  is

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a

B, A, C, D

b

D, A, C, B

c

D, C, A, B

d

B, C, A, D

answer is D.

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Detailed Solution

(A)  a=i+2j+3k      b=3i-2j+ka×b=ijk1233-21=i(2+6)-j(1-9)+k(-2-6) =8i+8j-8k

area of ||lelgram=|a×b|=81+1+1=83

(B)  area parallel gram =12|a×b|=43

(C)  d1=3i+j-2k      d2=i-3j+4kd1×d2=ijk31-21-34=i(-2)-j(14)+k(-10)|d1×d2|=4+196+100=103 

area of ||lel gram =12|d1×d2|=53

(D)  area of ||lelgram d1, d2  adjacent sides

 =|d1×d2|=103   

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