An Elementary Course of Plane GeometryThomas Murby, 1868 - 261 páginas |
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Página 3
... edge or ruler . B Fig . 6 . ruler we can draw , with pen or pencil ,. 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 dard yard at Westminster , by means ...
... edge or ruler . B Fig . 6 . ruler we can draw , with pen or pencil ,. 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 dard yard at Westminster , by means ...
Página 4
... edge of the ruler , and apply the same edge to the opposite side of the line ( fig . 7 ) . If the ruler touches the line in every part it is straight ; if not , it is curved . Fig . 7 . Rulers of glass or metal are not so liable to warp ...
... edge of the ruler , and apply the same edge to the opposite side of the line ( fig . 7 ) . If the ruler touches the line in every part it is straight ; if not , it is curved . Fig . 7 . Rulers of glass or metal are not so liable to warp ...
Página 10
... edge AA ' of which is straight ( fig . 17 ) , and fold it so that a portion , A O , of the line A A ' falls on the other portion , A ' O. Let OD be the crease made in the paper . The angle DOA is evidently equal to the angle DOA ' , for ...
... edge AA ' of which is straight ( fig . 17 ) , and fold it so that a portion , A O , of the line A A ' falls on the other portion , A ' O. Let OD be the crease made in the paper . The angle DOA is evidently equal to the angle DOA ' , for ...
Página 13
... edge , the other may exactly touch the second in every part . Joiners employ , for mortise work , etc. , the carpenters ' square . It is a square of wood ( fig . 24 ) formed of two parts , the arm L , and the base T , which is thicker ...
... edge , the other may exactly touch the second in every part . Joiners employ , for mortise work , etc. , the carpenters ' square . It is a square of wood ( fig . 24 ) formed of two parts , the arm L , and the base T , which is thicker ...
Página 14
... edge of the ruler , so that it may pass from its position E to E ' . If the edge of the square coincide in this new position with the line , it is true . Fig . 25 represents the test of an untrue square , each of the angles being less ...
... edge of the ruler , so that it may pass from its position E to E ' . If the edge of the square coincide in this new position with the line , it is true . Fig . 25 represents the test of an untrue square , each of the angles being less ...
Otras ediciones - Ver todas
An Elementary Course of Plane Geometry and Mensuration Richard Wormell Sin vista previa disponible - 2015 |
Términos y frases comunes
A B C adjacent angles alternate angles angle equal angular points apex base bisecting centre centre of symmetry chord circumscribed coincide compasses construction decagon describe a circle describe a circumference diagonals diameter dicular distance divide dodecagon draw a straight equilateral triangle extremities figure Find the area Geometry given angle given circle given point given polygon given radius given straight line half height Hence hexagon hypothenuse inscribed angle instrument intercepted isosceles triangle line drawn line joining line parallel measure middle point number of degrees number of sides octagon opposite angles opposite sides parallel lines parallel straight lines parallelogram pentagon perimeter perpen perpendicular plane point of contact point of intersection proportional Prove quadrilateral radii ratio rectangle regular polygon respectively equal rhombus right-angled triangle ruler secant segments similar similar triangles square symmetrical axis tangent touch vertical yards
Pasajes populares
Página 55 - ... parallel to the first. 75. No two straight lines drawn from the extremities of the base of a triangle to the opposite sides can possibly bisect each other. 76. If the opposite sides of a quadrilateral are equal it is a parallelogram. 77. If the opposite angles of a quadrilateral are equal it is a parallelogram. 78. The diagonals of a parallelogram bisect each other. 79. If the diagonals of a quadrilateral bisect each other it is a parallelogram. 80. If the straight line joining two opposite angles...
Página 151 - Describe a circle which shall pass through two given points, and have its centre in a given line.
Página 66 - 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.
Página 90 - There are two columns in the ruins of Persepolis, left standing upright ; one is 70 feet above the plane, and the other 50...
Página 5 - I., 5), (3) that, if two straight lines cut one another, the vertically opposite angles are equal (Eucl.
Página 77 - The square of the sum of two numbers is equal to the square of the first, plus twice the product of the first and the second, plus the square of the second.
Página 90 - May-pole, whose top was broken off" by a blast of wind, struck the ground at the distance of 15 feet from the foot of the pole ; what was the height of the whole May-pole, supposing the length of the broken piece to be 39 feet ?
Página 44 - S.SO. 1. Prove that, if two sides of a triangle are unequal, the angle opposite the greater side is greater than the angle opposite the less.