public double HD{get;set;}; public double HDA{get{return Math.Abs(HD);}} public int d{get{double d=HDA/Math.PI*}}

I'm sorry, but the code you provided is incomplete and contains errors. Specifically, the last property "d" is missing a return statement, and the calculation appears to be incomplete. Here is a corrected version of the code:

public double HD { get; set; }
public double HDA { get { return Math.Abs(HD); } }
public int d { get { return (int)(HDA / Math.PI * 180); } }

This code defines three properties: "HD", "HDA", and "d".

- "HD" is a public property of type "double" with a getter and setter method.
- "HDA" is a public property of type "double" with only a getter method. It returns the absolute value of "HD".
- "d" is a public property of type "int" with only a getter method. It calculates the degree value of "HDA" by dividing it by pi and converting the result to degrees (multiplying by 180). The result is then cast to an integer and returned.