Math Problem Statement
Двугранный угол при боковом ребре правильной треугольной пирамиды равен 120°, а сторона основания равна 3 √2 . Найдите боковую поверхность пирамиды.
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Solid Geometry
Pyramids
Trigonometry
Formulas
cos(θ) = h/l
Area of a triangle: S = (1/2) * base * height
Radius of a circumscribed circle in an equilateral triangle: R = a/√3
Theorems
Cosine rule
Area formulas for triangles
Pythagorean theorem
Suitable Grade Level
Grades 10-12
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