title: Creating method to draw a circle using the centre of the circle and radius
body: <p>The method I created worked to the point that it would create a circle in a pictureBox but it would only use the coordinates of a rectangle.</p>
  
  <p>I'm trying to create the following,</p>
  
  <ul>
  <li>Windows form with:
  <ul>
  <li>1 pictureBox</li>
  <li>1 textBox</li>
  <li>1 button</li>
  </ul></li>
  </ul>
  
  <p>textBox should be used to insert the radius for the circle.             </p>
  
  <pre><code>(double input=Convert.ToDouble(textBox1.Text)
  
  {
  private void button1_Click(object sender, EventArgs e)
  
      {
          double input....
          double radius= Math.PI*input*input;
          Graphics paper;
          paper = pictureBox1.CreateGraphics();
          Pen pen = new Pen(Color.Black);
          getCircle(paper, pen, (variables for center), radius);
      }
  private void getCircle(Graphics drawingArea, Pen penToUse, int xPos, int yPos, double radius);
  
  {
  }
  
  }
  </code></pre>
  
  <p>My problem here being I have no idea how to create a circle using <code>Math.PI*radius*radius</code> with pre determined centre coordinates.</p>
  
  <p>I would like to see an answer with coded method and <code>button_click</code></p>