Math Problem Statement
在四边形ABCD 中,对角线 AC 平分∠BAD,AB=21,AD=9,BC=CD=10,AC=?
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Triangles
Quadrilaterals
Angle Bisector Theorem
Cosine Rule
Formulas
Cosine Rule
Theorems
Angle Bisector Theorem
Suitable Grade Level
Grades 10-12
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