Sunto CA , CB semi-axes Hyperbolæ; PG , KD diametri conjugatæ; PF , Qt perpendicula ad diametros; & Qv ordinatim applicata ad diametrum GP . Agatur SP secans tum diametrum DK in E , tum ordinatim applicatam Qv in x , & compleatur parallelogrammum QRPx