triangle - funny and happy basic 2-dimensional geometry

line font diagram cartoon drawing brand logo circle text sketch number artwork wing iron symbol triangle funny happy basic 2-dimensional geometry figure teaching mathematics kindergarten cute warning traffic sign street workbook flat classroom triangle children 2d button symbol poster creative object road geometry decoration safety black white face corner figure math vector isolate cartoon quadrilateral element teach sign warning shape student simple traffic preschool expression area infographic cute kids fun happiness information character smile danger street emoji game cheerful worksheet homework sticker