This study extended over three months and involved 344 subjects. It compared the performance and attitudes of seventh-grade students taught geometry using the TI-92 calculator and a supplementary activity manual written to be used with the TI-92 calculator with the performance and attitudes of students using the traditional approach. On a comprehensive common post study geometry examination, the students who were taught geometry using the TI-92 calculator had significantly higher scores than those taught by traditional means. The students who were taught geometry using the TI-92 calculator had a significantly more positive attitude toward the study of geometry than students taught by traditional means. (Contains 14 references.) (Author/WRM)