HingeJoint.angle
var angle: float;
float angle;
angle as float
Description

The current angle in degrees of the joint relative to its rest position. (Read Only)

The rest angle between the bodies is always zero at the beginning of the simulation.
	print(hingeJoint.angle);
using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        print(hingeJoint.angle);
    }
}
import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		print(hingeJoint.angle)