FIRST BOOK
IN GENERAL

MATHEMATICS

BY

ROBERT KING ATWELL

HEAD OF DEPARTMENT OF MATHEMATICS,
UNIVERSITY OF PORTO RICO

DIAGRAMS BY

FRANK S. PUGH

SUPERVISOR OF MECHANIC ARTS,
DEPARTMENT OF EDUCATION, PORTO RICO

NEW YORK

PARKER P. SIMMONS CO., INC.

The straight line: plane: right angle: straight angle: circle:
degrees, minutes and seconds: change of angular units: addition
and subtraction of angles.

I. Shop Exercise: LEVELING DEVICES AND APPURTENANCES.

CHAPTER II.

STRAIGHT ANGLES AND PERPENDICULARS

PAGE 14

Axioms: supplementary angles: vertical angles: postulates:
theorems concerning perpendiculars: discussion of the straight
line.

II. Field Exercise: LOCATION OF CORNER STAKES FOR EXCA-
VATION FOR THE FOUNDATION OF A BUILDING.

CHAPTER III.

PARALLEL LINES

PAGE 30

Perpendiculars to same line: parallels to a given line: a line
perpendicular to one of two parallels: alternate interior angles:
exterior-interior angles.

IIIa. Shop Exercise: PARALLEL RULER.

IIIb. Field Exercise: MARKING CORNERS BY BATTER BOARDS.
Completion of work of laying out ground for excavation,
begun in Field Exercise II.