Найти периметр треугольника с вершинами в точках A(2, 4, 2, 4, 2), B(6, 4, 4, 4, 6), C(5, 7, 5, 7, 2).

AB = (6-2, 4-4, 4-2, 4-4, 6-2) = (4,0,2,0,4)AB = sqrt(36) = 6AC = (5-2, 7-4, 5-2, 7-4, 2-2) = (3,3,3,3,0)AC = sqrt(36) = 6BC = (5-6,7-4,5-4,7-4,6-2) = (-1,3,1,3,4)BC = sqrt (36) = 6P=3*6=18