Math Problem Statement
В параллелограмме АВСД, сторона АВ=7 см, сторона АД=15 см, угол А=60°.Найти диагональ ВД?
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Cosine Rule
Triangles
Parallelograms
Formulas
BD^2 = AB^2 + AD^2 - 2 * AB * AD * cos(∠A)
Theorems
Cosine Rule
Suitable Grade Level
Grades 9-11
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