Criminology is the scientific study of crimes and those who perform them. There are multitude of jobs within this field such as: Police officer, Crime scene investigator, prison physiologist, and security specialist. Study results showed that experience had a significant effect on the mean and root mean square (RMS) shooting errors at the target. Trigonometry can be used in various fields of work within criminology, but the job that uses trig the most is a crime scene investigator. A crime scene investigator would use Trig to analyze things such as Bullet Trajectories. Traditionally, studies on bullet trajectories have predominantly focused on scenarios involving general towers, those perpendicular to the ground. This study uses the Peter Chew Triangle diagram for bullet trajectories of leaning towers. They are currently the sine rule and the cosine rule for the topic solution of triangle, another important rule will be added in the future, the Peter Chew rule. The sine rule generally is used to find a non-included angle when we’re given two sides and a non-included angle or the opposite side angle given when are given two angles and one side. The cosine rule generally is used to find the angle when we’re given three sides or to find the third side when are given two sides and the included angle.Peter Chew Rule allow us to find a non included angle simple and directly when given 2 sides and an included angle.Peter Chew Method can let us to find the third side simple when given two sides and a non-included angle. The objective of Peter Chew Triangle Diagram is to clearly illustrate the topic solution of triangle and provide a complete design for the knowledge of AI age. Peter Chew’s triangle diagram will suggest a better single rule that allows us to solve any problem of topic solution of triangle problems simple, directly, more easily and more accurately to aid in mathematics teaching and learning, especially if similar COVID-19 problems arise in the future. Therefore, applying Peter Chew’s triangle diagram in criminology can help solve criminology problems simply and easily. The purpose of Peter Chew’s triangle diagram is the same as Albert Einstein’s famous quote Everything should be made as simple as possible, but not simpler.