[i] In [/i][i]Figure 14[/i][i] is an arbelos. Use the button "Play", to explore the construction of radius [math]r_{\left(B\right)}[/math][/i]  [i]of the Archimedean circle in arbelos. Build another Archimedean circle with radius [math]r_{\left(A\right)}[/math][/i] [i]. By using logic functions of GeoGebra, prove that [math]r_{\left(A\right)}=r_{\left(B\right)}[/math][/i] [i] [/i](van Lamoen, 2014, p. 253).