三角形的外接圆公式为 R = a (2sinA) = b (2sinB) = c (2sinC) = abc (4S)，其中a、b、c是三角形三边长，A、B、C分别是它们的对角 浏览全文>>
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三角形的外接圆公式是什么 简明推导与应用