45 lines
1004 B
C#
45 lines
1004 B
C#
namespace MindBox.Lib;
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public class Triangle : FlatShape
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{
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private readonly double[] _sides;
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public Triangle(double a, double b, double c)
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{
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_sides = new[] { a, b, c };
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if (_sides.Any(side => side <= 0))
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{
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throw new ArgumentException($"Side(s) cannot be non-positive: {string.Join(" ;", _sides.Where(side => side <= 0))}");
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}
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if (a >= b + c || b >= c + a || c >= a + b)
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{
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throw new ArgumentException($"Sides lengths are not valid: {a}, {b}, {c}");
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}
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}
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public override double GetArea()
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{
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if (_area != null)
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{
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return _area.Value;
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}
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else
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{
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double semiPerimeter = _sides.Sum() / 2;
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_area = Math.Sqrt(semiPerimeter *
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(semiPerimeter - _sides[0]) *
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(semiPerimeter - _sides[1]) *
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(semiPerimeter - _sides[2]));
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return _area.Value;
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}
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}
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public bool IsRight()
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{
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var sorted = _sides.OrderByDescending(x => x);
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double hypotenuse = sorted.First();
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var catheti = sorted.Skip(1);
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return hypotenuse * hypotenuse == catheti.Sum(x => x * x);
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}
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}
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