In industrial revolution 4.0, education must follow and utilize information and communication technology. Android is an operating system on mobile devices, and Indonesia's most popular and widely used mobile device operating system. The Open-Ended approach is an approach in mathematics learning that provides opportunities for students to explore open problems with various strategies for solving…
Mathematics has an important role to play in life. But the reality in the field shows that many students still have difficulty in understanding math lessons, including geometry. The evidence in the field shows that the results of learning geometry are still low. The difficulty in understanding this geometry material has an impact on other materials related to the geometry material itself. St…