# Best Practises ## Counting triangle Traces solution calculates the number of people that are passing by any area of interest in a camera. In order to define an area of interest, a *'counting triangle'* should be set. The *'counting triangle'* consists of a base and an apex. A base is used to calculate the number of people who pass by the line from both sides. An apex is used to define which side should be considered as an entrance. In order to send the coordinates of triangle use: * x1, y1; x2, y2 - to denote vertex of the base * x3, y3 - to denote the direction of the entrance(apex). See below in the examples: ![Examples of how to define counting triangles](/files/-McaDFnEA7oubEgtG219) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.traces.cloud/counting/best-practises.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.