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数学中考冲刺8：圆半径怎么求？添辅助线，半径是直角三角形斜边
数学中考冲刺8：圆的半径怎么求？添加辅助线，半径一般都是直角三角形斜边，通过勾股定理得方程。
初中数学，圆的计算和证明，垂径定理，圆周角圆心角，切线，扇形136/233
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