Math Problem Statement

Найти косинус угла между диагоналями параллелограмма ABCD, если A(1,2,0), B(-2,1,1), D(3,-1,3)

Solution

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Math Problem Analysis

Mathematical Concepts

Vector Algebra
Analytic Geometry

Formulas

Vector diagonal AC = A + D - B
Cosine of the angle between vectors: cos(θ) = (AC · BD) / (|AC| |BD|)

Theorems

Cosine Rule for Vectors

Suitable Grade Level

Grades 10-12