An Elementary Course of Plane GeometryThomas Murray, 1870 - 16 sider |
Inni boken
Resultat 1-5 av 38
Side vii
... many who otherwise would never obtain any useful knowledge of it . The logical relations of the propositions to one another , and the more diffi- cult questions , such as the application of proportion to Preface . vii.
... many who otherwise would never obtain any useful knowledge of it . The logical relations of the propositions to one another , and the more diffi- cult questions , such as the application of proportion to Preface . vii.
Side 3
... a straight - edge or ruler . Fig . 6 . Another easy method of obtaining a straight line is to fold a sheet of paper . 9. By means of the even drawing - board and straight ruler we can draw , with pen or pencil ,. B 2 Plane Geometry . 3.
... a straight - edge or ruler . Fig . 6 . Another easy method of obtaining a straight line is to fold a sheet of paper . 9. By means of the even drawing - board and straight ruler we can draw , with pen or pencil ,. B 2 Plane Geometry . 3.
Side 22
... obtained , for the plumb - line does not fall upon the perpendicular ; and as it is to the left of this line , the stake B , to the right , must be lowered still farther . In using the level , care must be taken to incline it to the ...
... obtained , for the plumb - line does not fall upon the perpendicular ; and as it is to the left of this line , the stake B , to the right , must be lowered still farther . In using the level , care must be taken to incline it to the ...
Side 23
... obtained . Questions for Examination . 1. What is meant by a vertical line , and what by a horizontal line ? 2. Define a plane . Show how to test the evenness of a drawing - board . 3. Define a straight line . of a ruler . Show how to ...
... obtained . Questions for Examination . 1. What is meant by a vertical line , and what by a horizontal line ? 2. Define a plane . Show how to test the evenness of a drawing - board . 3. Define a straight line . of a ruler . Show how to ...
Side 29
... obtain upon the inner circum- ference the same number of divisions , all equal to one another . If A D is an arc of 30 ° upon one , the lines O D , OA will intercept an arc of 30 ° upon the other . C Fig . 44 We see , therefore , that ...
... obtain upon the inner circum- ference the same number of divisions , all equal to one another . If A D is an arc of 30 ° upon one , the lines O D , OA will intercept an arc of 30 ° upon the other . C Fig . 44 We see , therefore , that ...
Andre utgaver - Vis alle
An Elementary Course of Plane Geometry and Mensuration Richard Wormell Ingen forhåndsvisning tilgjengelig - 2015 |
Vanlige uttrykk og setninger
A B C adjacent angles alternate angles angle equal angular points apex base bisect centre centre of symmetry chord circumscribed coincide construction contained cumference decagon describe a circle diagonals diameter dicular distance divide dodecagon draw a straight equal arcs equal circles equilateral triangle extremities figure Find the area Geometry given angle given circle given point given polygon given radius given straight line greater half height Hence hexagon hypothenuse inscribed inscribed angle instrument interior angles isosceles triangle length line drawn line joining line parallel measure middle point number of sides opposite angles opposite sides parallel straight lines parallelogram pentagon perimeter perpen perpendicular plane Plane Geometry point of contact point of intersection proportional protractor Prove quadrilateral radii ratio rectangle regular polygon respectively equal rhombus right-angled triangle ruler secant segments similar square symmetrical axis tangent vertical
Populære avsnitt
Side 33 - Any two sides of a triangle are together greater than the third side.
Side 266 - IF from any point without a circle two straight lines be drawn, one of which cuts the circle, and the other touches it ; the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, shall be equal to the square of the line which touches it.
Side vi - In my own time," says Seneca, "there have been inventions of this sort, transparent windows, tubes for diffusing warmth equally through all parts of a building, short-hand, which has been carried to such a perfection that a writer can keep pace with the most rapid speaker. But the inventing of such things is drudgery for the lowest slaves; philosophy lies deeper. It is not her office to teach men how to use their hands.
Side 59 - If a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles; and the three interior angles of every triangle are together equal to two right angles.
Side 146 - If from a point without a circle a tangent and a secant be drawn, the tangent is a mean proportional between the whole secant and its external segment.
Side 153 - Describe a circle which shall pass through two given points, and have its centre in a given line.
Side 68 - If two parallel lines are cut by a third straight line, the sum of the two interior angles on the same side of the transversal is equal to two right angles, (p.
Side 86 - If a straight line be divided into any two parts, the square on the whole line is equal to the squares on the two parts, together with twice the rectangle contained by the two parts.
Side 264 - To prove that the exterior angle of a triangle is equal to the sum of the two interior opposite angles (see fig.
Side 11 - I., 5), (3) that, if two straight lines cut one another, the vertically opposite angles are equal (Eucl.