30
&amp; s.x = -10;
-10
&amp; s.y = 5;
5
&amp; c.area();
314.1592653589793
&amp; c.perimeter();
62.83185307179586
&amp; s.area();
100
&amp; s.perimeter();
40
&amp; c.move(40, 40)
undefined
&amp; c.x
60
&amp; c.y
70
&amp; new Shape()
Error: Class Shape can not be instantiated
at repl:1:2
at REPLServer.self.eval (repl.js:110:21)
at Interface.&lt;anonymous&gt; (repl.js:239:12)
at Interface.EventEmitter.emit (events.js:95:17)
at Interface._onLine (readline.js:202:10)
at Interface._line (readline.js:531:8)
at In