Math Problem Statement
在四边形ABCD 中,对角线 AC 平分∠BAD,AB=21,AD=9,BC=CD=10,AC=?请用余弦定理列方程来解这个题目。
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Trigonometry
Cosine Rule
Formulas
Cosine rule: cos(θ) = (a^2 + b^2 - c^2) / (2ab)
Theorems
-
Suitable Grade Level
High School
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