Math Problem Statement
已知三角形ABC的内角A,B,C的对边分别为a,b,c,向量m=(a,cosA),n=(cosB,b-c),且m·n=c·cosA,三角形ABC外接圆面积为3Π,求A的值。
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Trigonometry
Vectors
Circle Geometry
Formulas
Vector dot product
Triangle's circumradius formula
Theorems
Properties of triangle
Circumcircle properties
Suitable Grade Level
High School