GeoGebra doesn’t have any tools to determine similarity. GeoGebra does, however, have a tool that can determine if there is congruence between two figures. Recall that if two figures are congruent, then they are similar as well—but the opposite is not always true! 
     GeoGebra Instruction 1
Algebra     View     and         Graphics     View     under         View     in         Menu.         Graphics     View.         They         can         be         anything,         as         long         as         GeoGebra     is         able         to         name         them.         AreCongruent(Object, Object)
in the Algebra View. Replace each Object field with the names of the         figures. 
If the figures are congruent, the word true will appear in the Algebra View. If they are not congruent, the word false will appear instead.