### Answer:

drawOval( 100-50, 300-50, 2*50, 2*50 )

Of course the method would work if you did the arithmetic and put
the results in the method call.

# Drawing Rectangles

To draw a rectangle,
use the `drawRect()`

method of the Graphics object.
This method looks like:

drawRect(int x, int y, int width, int height)

It draws the outline of a rectangle using the current pen color.
The left and right edges of the rectangle are at x and x + width respectively.
The top and bottom edges of the rectangle are at y and y + height respectively.

This method is also used to draw a square.
This applet draws a rectangle around the entire drawing area,
then puts another rectangle in the center.

import java.swing.JApplet;
import java.awt.*;
// assume that the drawing area is 150 by 150
public class SquareAndRectangle extends JApplet
{
final int areaSide = 150 ;
final int width = 100, height = 50;
public void paint ( Graphics gr )
{
setBackground( Color.green );
gr.setColor( Color.blue );
// outline the drawing area
gr.drawRect( 0, 0, areaSide-1, areaSide-1 );
// draw interior rectangle.
gr.drawRect( areaSide/2 - width/2 ,
areaSide/2 - height/2, width, height );
}
}

Here is what it draws on your screen:

In drawing the outer square, the value 1 was subtracted from its
width and height so that the edges would be inside the drawing area.