Which measurement technique involves measuring at right angles from the evidence to surrounding walls and surfaces?

• A. Rectangular coordinates
• B. Polar coordinates
• C. Triangulation
• D. Azimuth measurement

Answer: (A)

Measuring at right angles from the evidence to surrounding walls is using a rectangular coordinate framework. It creates a Cartesian grid on the scene by taking perpendicular distances to two perpendicular walls, giving precise x and y coordinates for the location. This straight-grid approach is especially practical in a room, where distances are measured along two perpendicular directions to map where items lie. In contrast, polar coordinates rely on a single reference point with distance and angle, triangulation uses lines from two fixed points to locate a point, and azimuth measures an angle from a reference direction like north. The described method specifically builds coordinates by perpendicular (right-angle) measurements to walls, which is characteristic of rectangular coordinates.