Q.

If the projections of a line of length d on the coordinate axes are d1,d2, d3 respectively, thend12+d22+ d32−d2=

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a

d2

b

1

c

0

d

None

answer is C.

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Detailed Solution

If d1,d2,d3are the projections of a line segment of length don the coordinate axes then d2=d12+d22+d32Therefore,  d12+d22+ d32−d2=0
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If the projections of a line of length d on the coordinate axes are d1,d2, d3 respectively, thend12+d22+ d32−d2=