A(-2;3)
B(1;-1)
C(2;4)
AB(вектор){1-(-2);-1-3}→AB{3;-4}
CA(вектор){-2-2;3-4}→CA{-4;-1}
|AB|=√3²+(-4)² = √9+16 = 5
|CA|=√(-4)²+(-1)² = √16+1 =√17
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A(-2;3)
B(1;-1)
C(2;4)
AB(вектор){1-(-2);-1-3}→AB{3;-4}
CA(вектор){-2-2;3-4}→CA{-4;-1}
|AB|=√3²+(-4)² = √9+16 = 5
|CA|=√(-4)²+(-1)² = √16+1 =√17