Трапеция KMNP задана координатами своих вершин K(-5;-2), M(-3;2), N(1, 3), P(3;-1), точка O - середина стороны NP. Найдите KN*KO (скалярное произведение векторов) и cosNKO. Определите вид треугольника KON

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