https://bbs.wenxuecity.com/znjy/6957546.html
心算得到三角形ABD的三邊長為,AD=9,BD=7,AB=12
所以麵積=31.305 (網絡麵積計算器的結果)
https://bbs.wenxuecity.com/znjy/6957546.html
心算得到三角形ABD的三邊長為,AD=9,BD=7,AB=12
所以麵積=31.305 (網絡麵積計算器的結果)
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