10//> val res51: Int = 10
10*1.4//> val res53: Double = 14.0
10*1.4*1.4
10*1.4*1.4*1.4
10*1.4*1.4*1.4*1.4
10*1.4*1.4*1.4*1.8*1.4
cleari()
setBackground(blue)
setPenColor(magenta)
setPenThickness(10)
forward(20)
setPenThickness(14)
forward(20)
setPenThickness(19.6)
forward(20)
setPenThickness(27.4)
forward(20)
setPenThickness(38.4)
forward(20)
setPenThickness(53.7)
forward(20)