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The number of different straight lines that areformed with A(2, 3), B(3, 4), C(5, 6), D(3, 7)are |
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Answer» AB=(2,3)(3,4); V(3-2)^2+(4-3)^3=V(-1)^2+(1)^2=V2; BC=(3, 4)(5,6); V(5-3)^2+(6-4)^2=V(2)^2+(2)^2=V4+4=V8=4V2_________(2); CD=(5, 6),(3, 7) . V(3-5)^2+(7-6)^2=V(2)^2+(1)^2=V5+1= V6_____________________(3); DA= (3, 7) (2, 3); V(2-3)^2+(3-7)^2=V('-1)^2+(-4)^2=V1+16=V17____(4) , AB+ BC+ CD+ DA=V2+ 4V2+ V6+ V17 |
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