From the figure, it can be observed that point A divides the field into three parts. These parts are triangular in shape -△PSA,△PAQ, and △QRAArea of △ PSA + Area of △ P A Q + Area of △ Q R A = Area of PQRS ... (1)We know that if a parallelogram and a triangle are on the same base and between the same parallels, then the area of the triangle is half the area of the parallelogram.∴ Area (ΔPAQ)=1/2 Area (PQRS) ... (2)From equations (1) and (2), we obtainArea (ΔPSA)+ Area (ΔQRA)=1/2 Area (PQRS) ... (3)Clearly, it can be observed that the farmer must sow wheat in triangular part PAQ and pulses in other two triangular parts PSA and QRA or wheat in triangular parts PSA and QRA and pulses in triangular parts PAQ.