АВ(-3-1; 1-1; 2-0); АВ(-4;0;2)
|АВ|=√((-4)²+0²+2²)=√20=2√5
АС(1-1; 2-1; 1-0); АС(0;1;1)
|АС|=√(0²+1²+1²)=√2
АВ×АС = (-4)×0 + 0×1 + 2×1 = 0+0+2 = 2.
АВ(-3-1; 1-1; 2-0); АВ(-4;0;2)
|АВ|=√((-4)²+0²+2²)=√20=2√5
АС(1-1; 2-1; 1-0); АС(0;1;1)
|АС|=√(0²+1²+1²)=√2
АВ×АС = (-4)×0 + 0×1 + 2×1 = 0+0+2 = 2.