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點樣用精準量度面積? https://blog.rcphk.com/%e5%b7%a5%e5%95%86%e8%88%96%e6%8a%95%e8%b3%87/%e9%bb%9e%e6%a8%a3%e7%94%a8%e7%b2%be%e6%ba%96%e9%87%8f%e5%ba%a6%e9%9d%a2%e7%a9%8d%ef%bc%9f/