Livres  Livres 1  2 sur 2 pour I meafured from its bottom a diftance of 40 feet, and then took the angle formed.... 
I meafured from its bottom a diftance of 40 feet, and then took the angle formed by the plane and a line drawn to the top 41"; and going 'on in the fame... An introduction to plain trigonometry, with its application to heights and ...  Page 82 de Richard Cockrel  1792  99 pages Affichage du livre entier 
