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...Geometry problems solved with geogebra adriana binzar ion mincu technical college timioara romania abstract in this paper one propose to solve some known using the purpose is highlight usefulness of software for writing solutions especially realization drawing which can simplify understanding mathematical solution introduction a dynamic free open source allows exposure view and practice mathematics knowledge order rapidly share understand information characterized by versatility dynamics possibility use it increasing number languages different versions installation online also spreading files on web everyone s benefit includes facilities several representations objects algebra spreadsheet are integrated an easily install application applications sequel triangle abc following notations will be used h orthocenter o circumcenter g center gravity problem euler circle prove that points ha hb hc foot heights b c means sides segments ah bh ch concyclic we constructed its highs highlighting th...