New Elementary Geometry: With Practical Applications ; a Shorter Course Upon the Basis of the Larger Work |
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Page 18
... Draw the straight line CD , making the angle BCD equal to B. Then , in the triangle BDC , we shall have the side BD equal to DC ( Theo . VII . ) . To each add DA , and C B we have BD plus DA equal to DC plus DA ; but D C plus DA is ...
... Draw the straight line CD , making the angle BCD equal to B. Then , in the triangle BDC , we shall have the side BD equal to DC ( Theo . VII . ) . To each add DA , and C B we have BD plus DA equal to DC plus DA ; but D C plus DA is ...
Page 20
... straight line . Draw A B perpendicular to DE , and the ob- lique lines A E , AC , AD . Pro- D duce A B till B F is equal to A B , and join CF , D F. A E C B First . The triangle BCF is equal to the triangle BCA , for F they have the ...
... straight line . Draw A B perpendicular to DE , and the ob- lique lines A E , AC , AD . Pro- D duce A B till B F is equal to A B , and join CF , D F. A E C B First . The triangle BCF is equal to the triangle BCA , for F they have the ...
Page 25
... draw the straight line IK , making IO equal to OK , and join HI . Then the opposite angles KOG , IO H , formed by the intersection of the two straight lines IK , GH , are equal ( Theo . III . ) ; and the triangles KOG , IOH have the ...
... draw the straight line IK , making IO equal to OK , and join HI . Then the opposite angles KOG , IO H , formed by the intersection of the two straight lines IK , GH , are equal ( Theo . III . ) ; and the triangles KOG , IOH have the ...
Page 26
... straight lines are perpendicular to an- other , they are parallel . THEOREM XVII . 64. If a straight line intersects ... draw the straight line KL through the point G , making the angle KGH equal to GHD ; then , since the alternate ...
... straight lines are perpendicular to an- other , they are parallel . THEOREM XVII . 64. If a straight line intersects ... draw the straight line KL through the point G , making the angle KGH equal to GHD ; then , since the alternate ...
Page 29
... draw the straight lines P A , P B , P C , PD , PE , to the vertices of all the angles , and the polygon will be divided into as many triangles as it has sides . Now , the sum of the three angles in each of these triangles is equal to ...
... draw the straight lines P A , P B , P C , PD , PE , to the vertices of all the angles , and the polygon will be divided into as many triangles as it has sides . Now , the sum of the three angles in each of these triangles is equal to ...
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Common terms and phrases
A B C A B equal ABCD ABCDEF adjacent angles allel alternate angles altitude angle ACD angle BAC antecedent base multiplied bases ABC bisect chord circumference cone consequently convex surface cylinder diagonal diameter divided draw the straight equal and parallel equal angles equal bases equal Theo equiangular equivalent feet formed four right angles frustum given straight line greater Greenleaf's half the sum homologous sides hypothenuse included angle inscribed angle inscribed circle interior angles intersection Let ABC line CD magnitudes mean proportional measured by half meet number of sides opposite parallelogram parallelopipedon perimeter perpendicular polyedron prism quadrilateral radii radius ratio rectangle regular polygon rhombus right angles Theo Scholium secant line side A B side BC slant hight Solid sphere square described tangent THEOREM third triangles ABC triangular triangular prism vertex volume
Popular passages
Page 23 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.
Page 29 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 83 - Two triangles, which have an angle of the one equal to an angle of the other, and the sides containing these angles proportional, are similar.
Page 85 - If in a right triangle a perpendicular is drawn from the vertex of the right angle to the hypotenuse : I.
Page 61 - At a point in a given straight line to make an angle equal to a given angle.
Page 57 - The angle formed by a tangent and a chord is measured by half the intercepted arc.
Page 62 - Through a given point to draw a straight line parallel to a given straight line, Let A be the given point, and BC the given straight line : it is required to draw through the point A a straight line parallel to BC.
Page 117 - If two angles not in the same plane have their sides parallel and lying in the same direction, these angles will be equal, and their planes will be parallel. Let...
Page 100 - The circumferences of circles are to each other as their radii, and their areas are to each other as the squares of their radii. Let C denote the circumference of one of ^ the circles, R its radius OA, A its area; and let C...
Page 88 - Similar polygons may be divided into the same number of triangles similar each to each, and similarly situated.