Make a Circle Collider2d's radius update based on a sprite mask's scale and size

As the title says, i want to have my player's circle collider radius to adjust as my sprite mask's scale and size gets smaller or larger. I'm running into a problem where i cant convert type Unity.Transform to a float?

Code (CSharp):

1.  
2. public class Player : MonoBehaviour {
3.  
4.     SpriteMask sm;
5.     CircleCollider2D cc;
6.     bool count;
7.  
8.  
9.     public float MOVEMENT_BASE_SPEED = 1.0f;
10.  
11.     [SerializeField] Vector2 movementDirection;
12.     [SerializeField] float speed;
13.  
14.     //[SerializeField] float speedMax; float speedMin = 0.0f;
15.  
16.     Rigidbody2D rb;
17.  
18.  
19.     // Use this for initialization
20.     void Start () {
21.         rb = GetComponent<Rigidbody2D>();
22.         cc = GetComponent<CircleCollider2D>();
23.         sm = FindObjectOfType<SpriteMask>();
24.         count = true;
25.     }
26.    
27.     // Update is called once per frame
28.     void Update () {
29.  
30.         Vector2 S = sm.GetComponent<SpriteMask>().transform.localScale;
31.         gameObject.GetComponent<BoxCollider2D>().size = S;
32.         gameObject.GetComponent<BoxCollider2D>().size = new Vector2((S.x ),S.y);
33.  
34.  
35.         sm.transform.position = gameObject.transform.position;
36.  
37.  
38.    
39.  
40.         sm.transform.localScale -= new Vector3(.1f, .1f, .1f);
41.            
42.  
43.            
44.            
45.        
46.  
47.        
48.        
49.     }
50.        

Any suggestions?