CS1 Standard Demo Page
The following text was written to the standard output stream when the ShapesThing.java program was executed from IntelliJ.

<p> square = < Square: side=400.0 > </p>
<p> area of square = 160000.0 </p>
<p> perimeter of square = 1600.0 </p>
<p> diagonal of square = 565.685424949238 </p>
<p> disk = < Circle: radius=200.0 > </p>
<p> area of disk = 125663.70614359173 </p>
<p> perimeter of disk = 1256.6370614359173 </p>
<p> diamond = < Square: side=282.842712474619 > </p>