1. Вычислим координаты векторов
АВ = {Xb-Xa; Yb-Ya} = {1+1;-sqrt(3)-sqrt(3)} = {2: -2sqrt(3)}
AC = {1.2+1 ; sqrt(3)-sqrt(3)} = {2.2;0}
2. (АB*AC)=Xab*Xac + Xab*Xac = 2*2.2 + ...*0 = 4,4
3. |AB| = sqrt(4 + 12) = 4
|AC| = sqrt(2.2^2+0) = 2.2
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Answers & Comments
1. Вычислим координаты векторов
АВ = {Xb-Xa; Yb-Ya} = {1+1;-sqrt(3)-sqrt(3)} = {2: -2sqrt(3)}
AC = {1.2+1 ; sqrt(3)-sqrt(3)} = {2.2;0}
2. (АB*AC)=Xab*Xac + Xab*Xac = 2*2.2 + ...*0 = 4,4
3. |AB| = sqrt(4 + 12) = 4
|AC| = sqrt(2.2^2+0) = 2.2