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FIRST LESSONS

IN

PLANE GEOMETRY.

TOGETHER

WITH AN APPLICATION OF THEM

TO THE

SOLUTION OF PROBLEMS.

SIMPLIFIED FOR BOYS NOT VERSED IN ALGEBRA.

BY FRANCIS J. GRUND,
Teacher of Mathematics, at Chauncy Hall-School.

BOSTON:

PUBLISHED BY CARTER AND HENDEE.

MDCCC XXX.

Ебля Т 148.30.436

S TH

GECKON

YELL

MAY 6, 1924

DISTRICT OF MASSACHUSETTS, TO WIT:
District Clerk's Office.

Be it remembered, that on the tenth day of February, A. D. 1830, in the fiftyfourth year of the Independence of the United States of America, FRANCIS J. GRUND, of the said district, has deposited in this office the title of a book, the right whereof he claims as author, in the words following, to wit:

"FIRST LESSONS IN PLANE GEOMETRY, together with an application of them to the SOLUTION OF PROBLEMS. Simplified for boys not versed in Algebra. By Francis J. Grund, Teacher of Mathematics at Chauncy Hall-School.'

In conformity to the act of the Congress of the United States, entitled 'An act for the encouragement of learning, by securing the copies of maps, charts, and books, to the authors and proprietors of such copies, during the times therein mentioned;' and also to an act, entitled 'An act supplementary to an act, entitled, an act for the encouragement of learning, by securing the copies of maps, charts, and books, to the authors and proprietors of such copies, during the times therein mentioned; and extending the benefits thereof to the arts of designing, engraving and etching historical and other prints.'

JNO. W. DAVIS,

Clerk of the District of Massachusetts.

PRINTED BY I. R. BUTTS....BOSTON.

Of Geometrical Proportions and Similarity of Triangles.

Theory of Geometrical Proportions

Similarity of Triangles

Recapitulation of the Truths contained in the Second Section,

Part I.

Recapitulation of the Truths contained in Part II.

Questions on Proportions

Questions on Similarity of Triangles