The condition of the Covid-19 pandemic that hit Indonesia, requires students and teachers to study from home in order to maintain their safety and health. However, entering the new normal era, people and even schools have started to carry out their usual activities while still paying attention to health protocols. Even though the learning process is still carried out online and offline, it is a challenge in learning mathematics. The purpose of this study is to analyze the mathematical reasoning abilities of students who take part in online and offline learning and to describe the attitudes of students who take online and offline learning towards learning mathematics in circle material. This research is an experimental research with the research instruments used are tests of mathematical reasoning abilities and questionnaires for implementing online and offline learning. This research was conducted on students of grade 11 science at SMA Negeri 14 Central Maluku. Based on the results of the study it was found that the mathematical reasoning abilities of students who received online and offline learning were more effective in the experimental class with the Inquiry-Discovery model compared to the control class. Thus learning using online and offline is suitable to be applied in learning mathematics, because students seem more active in solving the questions given by the teacher.