Master the principles of measurement and geometry with this classic textbook. The Commissioners of National Education in Ireland provide a detailed introduction to the science of mensuration, covering everything from the calculation of areas and volumes to trigonometry and spherical geometry. With numerous examples and exercises, this book is an essential resource for students and teachers alike. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.