The study investigated the effect of innovative strategy in the teaching and learning of mathematics plane geometry using GeoGebra software. Two research questions and two null hypotheses guided the study. The study is quasi-experimental, using pre-test and posttest control design. The study was carried out in Oshimili-South Local Government Area of Delta State. Purposive sampling of fifty-nine (59) SS2 mathematics students was made from the population of eight hundred and seventy-seven (877)

more »

... udents. The instrument used for the study was a Performance Mathematics Ability Test (PMAT). The reliability coefficient of the instrument was ascertained using Cronbach Alpha and was found to be 0.75. The findings showed that there was a significant difference between the mean performances of students' when taught plane geometry using GeoGebra software and problem based learning but no significant difference with respect to gender. It was recommended that enough mathematics software in schools especially GeoGebra should be provided.