The Fourth industrial revolution like the developments of robots, AI and automation seem inevitable and technical tools have had a major impact on advanced mathematics teaching and mathematics learning. Educator and researcher must think to create a new Technical tools to help mathematics teaching and mathematics learning for the needs of the AI age. Today’s online calculators and math applications, photo math applications and calculators contain only the knowledge already stated in the book such as the sine and cosine rule. However, some areas of mathematics today are not complete, which leads to a certain field where some of the same questions are difficult to solve or cannot be solved. As example, We realize that Math Portal is able to tackle problems that can be solved directly by sine rule or cosine rule. But when given problem with 2 sides and an included angle, if we use Math Portal to find other non-included angle, Math Portal will show error. Therefore, a new Technical Tool for solve this problem with complete design is needed today to help teach and learn in higher education, which is the main goal of the creation of PCET calculator. The PCET calculator design covers some future knowledge like Peter Chew rule that has not yet been covered in any textbook as of today. Peter Chew rule is created to solve the problem mention directly as complement rule of topic solution of triangle. PCET calculator having special functionalities, uses future knowledge in PCET calculator design such as Peter Chew Rule, Peter Chew Method and Peter Chew Theorem. it make PCET calculator can solve problems that today’s online calculators and math apps can’t solve right now.