Boundary element method is applied to obtain fields scattered from a conducting sphere. Magnetic field integral equation is used on the surfaces of the sphere where its surfaces are discretized into trilateral cells. Scattered fields in the conducting boundaries as well as in the great circle of about 3 radius of the sphere inclined about 45˚ from polarization plane of incident magnetic field. The radius of the sphere are taken from $\frac{0.5}{2π}\lambda $ to $\frac{3}{2π}\lambda $ and copolarized and cross-polarized fields are calculated. The errors contained in this calculations of the scattered fields are about 3 percentages for copolarized and about 7 percentages for cross-polarized scattered fields for the cell size of about 0.07λ. This error decreases as the cell size decreases where the cell size is about 0.04λ which yields about 2 percentages for copolarized and about 5 percentages for cross-polarized scattered fields.
