Simple angle calculation coming out wrong...?

Scripting
1

I have a simple piece of code to take the angle of an object and move it at a vector based on that angle. Problem is, that is comes out at the wrong vector so some reason.

Code is:

    void FireBullet() {
        delayBullet = 0;
        var bullet = (GameObject)Instantiate(bulletPrefab,
            this.GetComponent<Transform>().position,
            bulletPrefab.GetComponent<Transform>().rotation
            );
        Vector3 angles = bullet.GetComponent<Transform>().eulerAngles;
        float rad = angles.z * Mathf.Deg2Rad;
        Vector2 velocity;
        velocity.x = Mathf.Cos(angles.z);
        velocity.y = Mathf.Sin(angles.z);
        bullet.GetComponent<Rigidbody2D>().AddForce(velocity * bulletSpeed);
    }

Having the z angle of my bulletPrefab set to 90.0 degrees, ends up firing the projectile at about 110.0 degrees instead.

2

Thanks to everyone who came rushing out to help.

The solution was changing
velocity.x = Mathf.Cos(angles.z);
to
velocity.x = Mathf.Cos(rad);

3

Trigonometry is almost always done in radians and not degrees.

Of course some libraries may slip this up at times for stupid reasons.

Of course, documentation usually tells you: