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Eaton's Mathematical Series.

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ELEMENTARY

GEOMETRY.

BY

WILLIAM F. BRADBURY, A. M.,

HOPKINS MASTER IN THE CAMBRIDGE HIGH SCHOOL; AUTHOR OF A TREATISE ON TRIGONOMETRY
AND SURVEYING, AND OF AN ELEMENTARY ALGEBRA.

BOSTON.
THOMPSON, BIGELOW, AND BROWN.
25 & 29 CORNHILL.

PLIC LISAKY

248327

EATON'S

8327 Series of Mathematics,

A-TOR LENOX AND TILGENUNDATIONS

1902

USED WITH UNEXAMPLED SUCCESS IN THE BEST SCHOOLS AND
ACADEMIES OF THE COUNTRY.

EATON'S PRIMARY ARITHMETIC.

EATON'S INTELLECTUAL ARITHMETIC.

EATON'S COMMON SCHOOL ARITHMETIC.

EATON'S HIGH SCHOOL ARITHMETIC.

EATON'S ELEMENTS OF ARITHMETIC.

EATON'S GRAMMAR SCHOOL ARITHMETIC.

BRADBURY'S EATON'S ELEMENTARY ALGEBRA.

BRADBURY'S ELEMENTARY GEOMETRY.

BRADBURY'S ELEMENTARY TRIGONOMETRY.

BRADBURY'S GEOMETRY AND TRIGONOMETRY, in one volume.
BRADBURY'S TRIGONOMETRY AND SURVEYING.

KEYS OF SOLUTIONS TO COMMON SCHOOL AND HIGH
SCHOOL ARITHMETICS, TO ELEMENTARY ALGEBRA, Geom-
ETRY, AND TRIGONOMETRY, for the use of Teachers.

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in the Office of the Librarian of Congress, at Washington.

UNIVERSITY PRESS: WELCH, BIGELOW, & Co.,
CAMBRIDGE.

PREFACE.

A LARGE number of the Theorems usually presented in textbooks of Geometry are unimportant in themselves and in no way connected with the subsequent Propositions. By spending too much time on things of little importance, the pupil is frequently unable to advance to those of the highest practical value. In this work, although no important Theorem has been omitted, not one has been introduced that is not necessary to the demonstration of the last Theorem of the five Books, namely, that in relation to the volume of a sphere. Thus the whole constitutes a single Theorem, without an unnecessary link in the chain of reasoning.

These five Books, including Ratio and Proportion, are presented in eighty-one Propositions, covering only seventy pages. This brevity has been attained by omitting all unconnected propositions, and adopting those definitions and demonstrations that lead by the shortest path to the desired end. At the close of each Book are Practical Questions, serving partly as a review, partly as practical applications of the principles of the Book, and partly as suggestions to the teacher. As those who have not had experience in discovering methods of demonstration have but little real acquaintance with Geometry, there have been added to each Book, for those who have the time and the ability, Theorems for original demonstration. These Exercises, with different methods of proving propositions already demon

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