This paper investigates the computation of the radar cross section (RCS) of equilateral triangular targets using Monte Carlo numerical integration. The analysis employs the Physical Theory of Diffraction (PTD) to model the scattering behavior and numerically evaluates the RCS for a canonical planar geometry. A Python-based implementation is provided for an equilateral triangle with side lengths of 2 meters, illuminated by a 10 GHz radar wave. The simulation yields an RCS value of approximately 0.0292 m², showcasing the effectiveness of the Monte Carlo approach for RCS estimation in simple geometries. This work contributes to the understanding of electromagnetic scattering and stealth design methodologies.