Sitque AG altera linea, ex qua cum GE hyperbola describitur, sintque QR er ST sinus radij egredientis et ingredientis ad perpendicularem HQ, quae tangentem GM secat ad angulos rectos.
And the AG of the other line, from which it described as a hyperbola with GE, let QR er ST bay rays going out and going to the perpendicular HQ, which is tangent to the GM cuts at right angles.