# 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:

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