""A Key to the Exercises in the First Six Books of Casey's Elements of Euclid"" is a book written by Joseph B. Casey and published in 1885. The book serves as a guide for students who are studying Euclidean geometry using Casey's textbook ""Elements of Euclid."" It contains solutions and explanations for the exercises found in the first six books of the textbook, which cover topics such as lines, angles, triangles, circles, and proportions. The book is intended to help students better understand and apply the principles of Euclidean geometry, and is a valuable resource for anyone studying or teaching the subject.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.