Designing and Developing Applications to Support with Problem-Based
Learning Management in Geometry: A Study on Impacts on Mathematical Resilience, Self-Efficacy and Learning Achievement of the Phra Dabos School's Students

Mathematics is a science that plays an important role in the development of human thinking, enabling human beings to be creative, reason systematically, with a pattern, thoroughly and carefully analyze problems and situations, and be able to anticipate, plan, decide, and solve problems properly. Therefore, mathematics is a tool for studying science and technology and other related sciences. In addition, mathematics helps to develop a complete human being, that is, to be balanced physically, mentally, intellectually, and emotionally, able to think, act, solve problems, and be able to exist, together with others happily (Ministry of Education, 2008, p. 1). For learners to learn mathematics well and effectively, they must develop a desire to learn and like to learn. Happy learning, even though the lessons are difficult, the learners always have a good mood for math lessons, which learners with this positive attitude are called mathematical indomitability Mathematical Resilience Mathematics impatience is imperative for those who study mathematics. It is essential for those who think math is complex or cannot learn it. Study yourself as someone who is not good at studying. Problems from the students' concepts have always caused problems in mathematics and the education of Thai youths. Problems with students' conception of mathematics also affect the students' future. We will find that most students tend to choose to study in a career or faculty and subject group that does not have to deal with mathematics. Mathematics indomitableness is necessary.
Moreover, besides the mathematical indomitable, There are also studies on self-efficacy. Self-efficacy is where individuals make decisions about their ability to manage and act. Perform behaviors to achieve the set goals The results showed that Self-efficacy was strongly positively associated with academic achievement in mathematics (Ayotola and Adedeji, 2009). The perception of one's abilities affects a person's actions, and also believe that self-efficacy in each situation is different and may show different behaviors, which shows that people's ability is not fixed, but be flexible according to the situation. So what determines the performance of an expression? Therefore, it depends on the self-efficacy in that situation; if we believe that we are capable, We will show that ability to come out. People who believe they are capable will have patience and perseverance, are not easily discouraged, and eventually succeed (Bandura, 1986).
An era where technology plays a role in daily life. This makes teaching and learning to involve technology in the form of various media, including video. Computer-assisted instruction, including applications, by using appropriate media for learners, will enable learners to learn effectively, resulting in the development of teaching materials in the form of applications on smartphones or tablets as another way that learning is not limited to within the classroom. It is also convenient to review Lessons wherever you want. Therefore, these people must use appropriate learning materials (Kornkanok Klangboonkhrong, 2012).
Therefore, the researcher wants to design and develop an application for problem-based learning management. to review knowledge in mathematics Learning unit on geometry for disciples of Phra Dabos Phra Dabos School. This is a way to improve and improve student-centered mathematics teaching and learning to be more effective make teaching mathematics. It is diverse and can be applied as a guideline for teaching and learning Dabos Volunteer in Mathematics for Industrial Technicians in other learning units.