[i][justify]An arbelos, formed by the semicircles [math]\left\{k_1,k_3,k_4\right\}[/math] is similar to the arbelos, formed by the semicircles [math]\left\{k,k_1,k_2\right\} [/math](Worksheet "Dodge's Archimedean circle"). If it is given an Archimedean circle with a center [math]O_4[/math], then build by GeoGebra Archimedean circle in the arbelos with the biggest semicircle [math]k_2[/math](Dodge, Schoch, Woo, & Yiu, 1999, p. 205). [/i][/justify]