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Its all about math....help!?

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ok, the question says: SHow that that fisure determined by the points is the indicated type.

Right triagle : ( -2,1 ), ( 3,11 ), ( 7,9 )

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  1. Let a=-2i+j,b=3i+11j,c=7i+9j

    are 3 vectors,then

    b-a=5i+10j

    c-b=4i-2j

    (b-a).(c-b)=

    20-20=0=>

    AB is perpendicular to BC,so it is a right traingle.

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