00791nam 2200253z- 450 991068833770332119841012000000.0(CKB)5400000000043224(EXLCZ)99540000000004322420220406c1986uuuu -u- -engTurtle geometry the computer as a medium for exploring mathematics /Harold Abelson, Andrea A. diSessaThe MIT Press0-262-01063-1 Turtle Geometry GeometryComputer-assisted instructionGeometryComputer-assisted instruction.516/.007/8Abelson Harold27443DiSessa Andrea A44127BOOK9910688337703321Turtle geometry1533858UNINA