Read Ebook: Marks' first lessons in geometry In two parts. Objectively presented and designed for the use of primary classes in grammar schools academies etc. by Marks Bernhard

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Ebook has 1106 lines and 33828 words, and 23 pages

LINES 9

POINTS 9

CROOKED LINES 10

CURVED LINES 11

STRAIGHT LINES 11

OTHER LINES 11

POSITIONS OF LINES 14

ANGLES 17

RELATIONS OF ANGLES 20

ADJACENT ANGLES 20

VERTICAL ANGLES 21

KINDS OF ANGLES 23

RIGHT ANGLES 23

ACUTE ANGLES 24

OBTUSE ANGLES 24

RELATIONS OF LINES 27

PERPENDICULAR LINES 27

PARALLEL LINES 28

OBLIQUE LINES 28

INTERIOR ANGLES 30

EXTERIOR ANGLES 31

OPPOSITE ANGLES 32

ALTERNATE ANGLES 33

PROBLEMS RELATING TO ANGLES 38

POLYGONS 40

TRIANGLES 44

ISOSCELES TRIANGLES 48

PROBLEMS RELATING TO TRIANGLES 53

QUADRILATERALS 55

PARALLELOGRAMS 59

COMPARISON AND CONTRAST OF FIGURES 62

MEASUREMENT OF SURFACES 66

PROBLEMS RELATING TO SURFACES 71

THE CIRCLE AND ITS LINES 73

ARCS AND DEGREES 78

PARTS OF THE CIRCLE 82

THEOREMS. ILLUSTRATED 88

FIRST LESSONS IN GEOMETRY.

PART FIRST.

LESSON FIRST.

LINES.

NOTE TO THE TEACHER.--In all the development-lessons, the pupils are to be occupied with the diagrams, and not with the printed matter.

See Note A, Appendix.

Refer to DIAGRAM 1, and show that

They have a little width, that they may be seen.

POINTS

Show that

Position is denoted by a point.

It occupies no space.

The ends of a line are points.

A line may be regarded as a succession of points.

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