P-P Situation 7: Problem 13.
P-P Situation 7:
An arbelos, formed by the semicircles is similar to the arbelos, formed by the semicircles (Worksheet "Dodge's Archimedean circle"). If it is given an Archimedean circle with a center , then build by GeoGebra Archimedean circle in the arbelos with the biggest semicircle (Dodge, Schoch, Woo, & Yiu, 1999, p. 205).