Math.PI Field
.NET Framework (current version)
Represents the ratio of the circumference of a circle to its diameter, specified by the constant, π.
Assembly: mscorlib (in mscorlib.dll)
The value of this field is 3.14159265358979323846.
The following example uses PI to assist in the computation of the inner angles of a given trapezoid.
/// <summary> /// The following class represents simple functionality of the trapezoid. /// </summary> using System; namespace MathClassCS { 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 trapezoid'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"); } } }
Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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