The objectives of this research study are 1) to apply Photomath in organizing mathematics teaching and learning. About the Pythagorean theorem for Mathayom 2 students to be effective 2) to develop mathematics learning achievement About the Pythagorean theorem For Mathayom 2 students 3) To create satisfaction with the application of Photomath in teaching mathematics. For Mathayom 2 students, the population used in the study is Mathayom 2 students, semester 1, academic year 2023, Sa School, Wiang Sa District, Nan Province, 1 classroom, 40 Mathayom 2 students, using the method Cluster random sampling. The tools used to collect data include 1) learning management plans, 2) pre-study and post-study achievement tests, 3) satisfaction questionnaires regarding the application of Photomath in management. teaching Statistics used in data analysis include E1 / E2, mean, standard deviation. and results of t-test (Dependent Samples)