Method of computing areas

(1) The rectilinear areas of parcels, the boundaries of which have been fixed, shall be computed mathematically. (2) When a portion of the boundary of a parcel, the boundaries of which have been fixed, shall be computed mathematically. (3) If necessary, the co-ordinates of accurately scaled points on the drawing of the curvilinear boundary shall be used in the computation, in order to reduce to a minimum, the area to be determined by the planimeter.