https://bbs.wenxuecity.com/znjy/6957546.html
心算得到三角形ABD的三边长为,AD=9,BD=7,AB=12
所以面积=31.305 (网络面积计算器的结果)
https://bbs.wenxuecity.com/znjy/6957546.html
心算得到三角形ABD的三边长为,AD=9,BD=7,AB=12
所以面积=31.305 (网络面积计算器的结果)
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