Question 322126
<pre><b>
That's the diamond-shaped figure, called the rhombus:

{{{drawing(300,400,-1,3,-2,2,
 
line(0,0,1,2),line(1,2,2,0),line(0,0,1,-2),line(1,-2,2,0) )}}}

A square is a special case of a rhombus, the one that has
four right angles  (think of a baseball diamond, which is really
a square):

{{{drawing(400,400,-.5,3.5,-2,2,
 
line(0,0,sqrt(2),sqrt(2)),line(sqrt(2),sqrt(2),2sqrt(2),0),
line(0,0,sqrt(2),-sqrt(2)),line(sqrt(2),-sqrt(2),2sqrt(2),0) )}}}

Edwin</pre>