Line renderer how to create and edit

Hello I am trying to create a simple circle but i keep getting an error with my script.

The error is:

 The type or namespace name `lineRenderer` could not be found. Are you missing a using directive or an assembly reference?

I don't know what my mistake is I am trying to learn as I go by looking at other people's example codes yet this happens.

This is my current code:

 using UnityEngine;
 using System.Collections;
 
 public class CircleTest : MonoBehaviour {
 
     public float radius         = 1.0f;
     public int      vertexCount    = 20;
     public Color color1            = new Color(0.5f,0.5f,0.5f,1.0f);
 
     private int             angle;
     private Vector3         pos;
     private lineRenderer     LineRenderer;
 
     void Start()
     {
         LineRenderer = gameObject.AddComponent<LineRenderer> ();
         LineRenderer.SetColors(c1, c1);
         LineRenderer.SetWidth(0.05, 0.05);
         LineRenderer.SetVertexCount(vertexCount+1);
 
 
         for(int i = 0; i < vertexCount+1; i++)
         {
             angle     = i;
             i         = (i / vertexCount) * Mathf.PI * 2;
             pos     = new Vector3(Mathf.Cos(angle), Mathf.Sin(angle), 0) * radius;
             LineRenderer.SetPosition(i, pos);
         }
     }
 }

Currently my game simply has an empty game object with this C# script attached. I didn't manually add a Line Render component as I assume the C# script does that for me in the Start function.

So what am i getting wrong here?