Ex.18
จุดตัดแกน Y (0.00,5.00)
Ex.9
https://l.facebook.com/l.php?u=https%3A%2F%2Fengfanatic.tumcivil.com%2Fengfanatic%2Fsoftware%2F295-RDD-%25E0%25B8%25AD%25E0%25B8%25AD%25E0%25B8%2581%25E0%25B9%2581%25E0%25B8%259A%25E0%25B8%259A%25E0%25B9%2581%25E0%25B8%25A5%25E0%25B8%25B0%25E0%25B8%2584%25E0%25B8%25B3%25E0%25B8%2599%25E0%25B8%25A7%25E0%25B8%2593%25E0%25B8%259E%25E0%25B8%25B7%25E0%25B9%2589%25E0%25B8%2599%25E0%25B8%2596%25E0%25B8%2599%25E0%25B8%2599%3Fd%3D1%26fbclid%3DIwAR1eIy_0HqyjedSLTntwTx8c6fkvSrrxMT5_BSpjk9TVj8HbjBQWyBWwoj0&h=AT0Ks76dfbaSuroEKXVdXYuYh8Z03xlgOGvsBkxsRCoctpRCrpCxypfS-_VKQOBTy-w55BpmtZ7U7395dHbtFWfnXC5nAKw-24DgNdzAWn7sPOfA_Bf_c5QKiQdUHixgtqGL
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