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@@ -255,3 +255,23 @@ else
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}
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```
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+##### Задание №9
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+```
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+const double Ax = 0, Ay = 0;
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+const double Bx = 4, By = 0;
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+const double Cx = 0, Cy = 3;
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+
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+Console.WriteLine("Введите координаты точки D (x y):");
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+double Dx = double.Parse(Console.ReadLine());
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+double Dy = double.Parse(Console.ReadLine());
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+
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+double ABC = Math.Abs((Bx - Ax) * (Cy - Ay) - (Cx - Ax) * (By - Ay)) / 2;
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+double ABD = Math.Abs((Bx - Ax) * (Dy - Ay) - (Dx - Ax) * (By - Ay)) / 2;
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+double ACD = Math.Abs((Dx - Ax) * (Cy - Ay) - (Cx - Ax) * (Dy - Ay)) / 2;
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+double BCD = Math.Abs((Cx - Bx) * (Dy - By) - (Dx - Bx) * (Cy - By)) / 2;
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+
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+if (Math.Abs(ABC - (ABD + ACD + BCD)) < 0.000001)
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+Console.WriteLine("Точка принадлежит треугольнику");
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+else
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+Console.WriteLine("Точка не принадлежит треугольнику");
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+```
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