Math.PI フィールド
アセンブリ: mscorlib (mscorlib.dll 内)


このフィールドの値は 3.14159265358979323846 です。

指定された不等辺四辺形の内角を計算するために PI を使用する方法については、次のコード例を参照してください。
'The following class represents simple functionallity of the Trapezoid Class MathTrapezoidSample Private m_longBase As Double Private m_shortBase As Double Private m_leftLeg As Double Private m_rightLeg As Double Public Sub New(ByVal longbase As Double, ByVal shortbase As Double, ByVal leftLeg As Double, ByVal rightLeg As Double) m_longBase = Math.Abs(longbase) m_shortBase = Math.Abs(shortbase) m_leftLeg = Math.Abs(leftLeg) m_rightLeg = Math.Abs(rightLeg) End Sub Private Function GetRightSmallBase() As Double GetRightSmallBase = (Math.Pow(m_rightLeg, 2) - Math.Pow(m_leftLeg, 2) + Math.Pow(m_longBase, 2) + Math.Pow(m_shortBase, 2) - 2 * m_shortBase * m_longBase) / (2 * (m_longBase - m_shortBase)) End Function Public Function GetHeight() As Double Dim x As Double = GetRightSmallBase() GetHeight = Math.Sqrt(Math.Pow(m_rightLeg, 2) - Math.Pow(x, 2)) End Function Public Function GetSquare() As Double GetSquare = GetHeight() * m_longBase / 2 End Function Public Function GetLeftBaseRadianAngle() As Double Dim sinX As Double = GetHeight() / m_leftLeg GetLeftBaseRadianAngle = Math.Round(Math.Asin(sinX), 2) End Function Public Function GetRightBaseRadianAngle() As Double Dim x As Double = GetRightSmallBase() Dim cosX As Double = (Math.Pow(m_rightLeg, 2) + Math.Pow(x, 2) - Math.Pow(GetHeight(), 2)) / (2 * x * m_rightLeg) GetRightBaseRadianAngle = Math.Round(Math.Acos(cosX), 2) End Function Public Function GetLeftBaseDegreeAngle() As Double Dim x As Double = GetLeftBaseRadianAngle() * 180 / Math.PI GetLeftBaseDegreeAngle = Math.Round(x, 2) End Function Public Function GetRightBaseDegreeAngle() As Double Dim x As Double = GetRightBaseRadianAngle() * 180 / Math.PI GetRightBaseDegreeAngle = Math.Round(x, 2) End Function Public Shared Sub Main() Dim trpz As MathTrapezoidSample = New MathTrapezoidSample(20, 10, 8, 6) Console.WriteLine("The trpezoid's bases are 20.0 and 10.0, the trapezoid's legs are 8.0 and 6.0") Dim h As Double = trpz.GetHeight() Console.WriteLine("Trapezoid height is: " + h.ToString()) Dim dxR As Double = trpz.GetLeftBaseRadianAngle() Console.WriteLine("Trapezoid left base angle is: " + dxR.ToString() + " Radians") Dim dyR As Double = trpz.GetRightBaseRadianAngle() Console.WriteLine("Trapezoid right base angle is: " + dyR.ToString() + " Radians") Dim dxD As Double = trpz.GetLeftBaseDegreeAngle() Console.WriteLine("Trapezoid left base angle is: " + dxD.ToString() + " Degrees") Dim dyD As Double = trpz.GetRightBaseDegreeAngle() Console.WriteLine("Trapezoid left base angle is: " + dyD.ToString() + " Degrees") End Sub End Class
/// <summary> /// The following class represents simple functionallity of the Trapezoid /// </summary> class MathTrapezoidSample { private double m_longBase; private double m_shortBase; private double m_leftLeg; private double m_rightLeg; public MathTrapezoidSample(double longbase, double shortbase, double leftLeg, double rightLeg) { m_longBase = Math.Abs(longbase); m_shortBase = Math.Abs(shortbase); m_leftLeg = Math.Abs(leftLeg); m_rightLeg = Math.Abs(rightLeg); } private double GetRightSmallBase() { return (Math.Pow(m_rightLeg,2.0) - Math.Pow(m_leftLeg,2.0) + Math.Pow(m_longBase,2.0) + Math.Pow(m_shortBase,2.0) - 2* m_shortBase * m_longBase)/ (2*(m_longBase - m_shortBase)); } public double GetHeight() { double x = GetRightSmallBase(); return Math.Sqrt(Math.Pow(m_rightLeg,2.0) - Math.Pow(x ,2.0)); } public double GetSquare() { return GetHeight() * m_longBase / 2.0; } public double GetLeftBaseRadianAngle() { double sinX = GetHeight()/m_leftLeg; return Math.Round(Math.Asin(sinX),2); } public double GetRightBaseRadianAngle() { double x = GetRightSmallBase(); double cosX = (Math.Pow(m_rightLeg,2.0) + Math.Pow(x,2.0) - Math.Pow(GetHeight() ,2.0))/(2*x*m_rightLeg); return Math.Round(Math.Acos(cosX),2); } public double GetLeftBaseDegreeAngle() { double x = GetLeftBaseRadianAngle() * 180/ Math.PI; return Math.Round(x,2); } public double GetRightBaseDegreeAngle() { double x = GetRightBaseRadianAngle() * 180/ Math.PI; return Math.Round(x,2); } static void Main(string[] args) { MathTrapezoidSample trpz = new MathTrapezoidSample(20.0, 10.0, 8.0, 6.0); Console.WriteLine("The trpezoid's bases are 20.0 and 10.0, the trapezoid's legs are 8.0 and 6.0"); double h = trpz.GetHeight(); Console.WriteLine("Trapezoid height is: " + h.ToString()); double dxR = trpz.GetLeftBaseRadianAngle(); Console.WriteLine("Trapezoid left base angle is: " + dxR.ToString() + " Radians"); double dyR = trpz.GetRightBaseRadianAngle(); Console.WriteLine("Trapezoid right base angle is: " + dyR.ToString() + " Radians"); double dxD = trpz.GetLeftBaseDegreeAngle(); Console.WriteLine("Trapezoid left base angle is: " + dxD.ToString() + " Degrees"); double dyD = trpz.GetRightBaseDegreeAngle(); Console.WriteLine("Trapezoid left base angle is: " + dyD.ToString() + " Degrees"); } }
/// <summary> /// The following class represents simple functionality of the Trapezoid /// </summary> public ref class MathTrapezoidSample { private: double m_longBase; double m_shortBase; double m_leftLeg; double m_rightLeg; public: MathTrapezoidSample( double longbase, double shortbase, double leftLeg, double rightLeg ) { m_longBase = Math::Abs( longbase ); m_shortBase = Math::Abs( shortbase ); m_leftLeg = Math::Abs( leftLeg ); m_rightLeg = Math::Abs( rightLeg ); } private: double GetRightSmallBase() { return (Math::Pow( m_rightLeg, 2.0 ) - Math::Pow( m_leftLeg, 2.0 ) + Math::Pow( m_longBase, 2.0 ) + Math::Pow( m_shortBase, 2.0 ) - 2 * m_shortBase * m_longBase) / (2 * (m_longBase - m_shortBase)); } public: double GetHeight() { double x = GetRightSmallBase(); return Math::Sqrt( Math::Pow( m_rightLeg, 2.0 ) - Math::Pow( x, 2.0 ) ); } double GetSquare() { return GetHeight() * m_longBase / 2.0; } double GetLeftBaseRadianAngle() { double sinX = GetHeight() / m_leftLeg; return Math::Round( Math::Asin( sinX ), 2 ); } double GetRightBaseRadianAngle() { double x = GetRightSmallBase(); double cosX = (Math::Pow( m_rightLeg, 2.0 ) + Math::Pow( x, 2.0 ) - Math::Pow( GetHeight(), 2.0 )) / (2 * x * m_rightLeg); return Math::Round( Math::Acos( cosX ), 2 ); } double GetLeftBaseDegreeAngle() { double x = GetLeftBaseRadianAngle() * 180 / Math::PI; return Math::Round( x, 2 ); } double GetRightBaseDegreeAngle() { double x = GetRightBaseRadianAngle() * 180 / Math::PI; return Math::Round( x, 2 ); } }; int main() { MathTrapezoidSample^ trpz = gcnew MathTrapezoidSample( 20.0,10.0,8.0,6.0 ); Console::WriteLine( "The trpezoid's bases are 20.0 and 10.0, the trapezoid's legs are 8.0 and 6.0" ); double h = trpz->GetHeight(); Console::WriteLine( "Trapezoid height is: {0}", h.ToString() ); double dxR = trpz->GetLeftBaseRadianAngle(); Console::WriteLine( "Trapezoid left base angle is: {0} Radians", dxR.ToString() ); double dyR = trpz->GetRightBaseRadianAngle(); Console::WriteLine( "Trapezoid right base angle is: {0} Radians", dyR.ToString() ); double dxD = trpz->GetLeftBaseDegreeAngle(); Console::WriteLine( "Trapezoid left base angle is: {0} Degrees", dxD.ToString() ); double dyD = trpz->GetRightBaseDegreeAngle(); Console::WriteLine( "Trapezoid left base angle is: {0} Degrees", dyD.ToString() ); }
/// <summary> /// The following class represents simple functionallity of the Trapezoid /// </summary> class MathTrapezoidSample { private double mLongBase; private double mShortBase; private double mLeftLeg; private double mRightLeg; public MathTrapezoidSample(double longBase, double shortBase, double leftLeg, double rightLeg) { mLongBase = System.Math.Abs(longBase); mShortBase = System.Math.Abs(shortBase); mLeftLeg = System.Math.Abs(leftLeg); mRightLeg = System.Math.Abs(rightLeg); } //MathTrapezoidSample private double GetRightSmallBase() { return (System.Math.Pow(mRightLeg, 2.0) - System.Math.Pow(mLeftLeg, 2.0) + System.Math.Pow(mLongBase, 2.0) + System.Math.Pow(mShortBase, 2.0) - 2 * mShortBase * mLongBase) / (2 * (mLongBase - mShortBase)); } //GetRightSmallBase public double GetHeight() { double x = GetRightSmallBase(); return System.Math.Sqrt(System.Math.Pow(mRightLeg, 2.0) - System.Math.Pow(x, 2.0)); } //GetHeight public double GetSquare() { return GetHeight() * mLongBase / 2.0; } //GetSquare public double GetLeftBaseRadianAngle() { double sinX = GetHeight() / mLeftLeg; return System.Math.Round(System.Math.Asin(sinX), 2); } //GetLeftBaseRadianAngle public double GetRightBaseRadianAngle() { double x = GetRightSmallBase(); double cosX = (System.Math.Pow(mRightLeg, 2.0) + System.Math.Pow(x, 2.0) - System.Math.Pow(GetHeight(), 2.0)) / (2 * x * mRightLeg); return System.Math.Round(System.Math.Acos(cosX), 2); } //GetRightBaseRadianAngle public double GetLeftBaseDegreeAngle() { double x = GetLeftBaseRadianAngle() * 180 / System.Math.PI; return System.Math.Round(x, 2); } //GetLeftBaseDegreeAngle public double GetRightBaseDegreeAngle() { double x = GetRightBaseRadianAngle() * 180 / System.Math.PI; return System.Math.Round(x, 2); } //GetRightBaseDegreeAngle public static void main(String[] args) { MathTrapezoidSample trpz = new MathTrapezoidSample(20.0, 10.0, 8.0, 6.0); Console.WriteLine("The trpezoid's bases are 20.0 and 10.0," + " the trapezoid's legs are 8.0 and 6.0"); double h = trpz.GetHeight(); Console.WriteLine("Trapezoid height is: " + System.Convert.ToString(h)); double dxR = trpz.GetLeftBaseRadianAngle(); Console.WriteLine("Trapezoid left base angle is: " + System.Convert.ToString(dxR) + " Radians"); double dyR = trpz.GetRightBaseRadianAngle(); Console.WriteLine("Trapezoid right base angle is: " + System.Convert.ToString(dyR) + " Radians"); double dxD = trpz.GetLeftBaseDegreeAngle(); Console.WriteLine("Trapezoid left base angle is: " + System.Convert.ToString(dxD) + " Degrees"); double dyD = trpz.GetRightBaseDegreeAngle(); Console.WriteLine("Trapezoid left base angle is: " + System.Convert.ToString(dyD) + " Degrees"); } //main } //MathTrapezoidSample

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