The name of the figure formed by the points (−1,−3,4),(5,−1,1),(7,−4,7) and (1,−6,10) is a
A
square
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B
rhombus
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C
parallelogram
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D
rectangle
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Solution
The correct option is B rhombus The four vectors, describing sides are (6,2,−3),(2,−3,6),(−6,−2,3)and(−2,3,−6). We thus observe that the four sides are just formed by the interchange of digits and so their magnitude has to be constant. We take the dot product of any 1 pair to verify that it is not 0. Thus we have the polynomial as a rhombus.