New Elementary Geometry: With Practical Applications ; a Shorter Course Upon the Basis of the Larger Work |
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Page 8
... angles have the same vertex , the letter at the vertex always occupies the middle place ; as the angle ACD or DCB . 11. Two straight lines are said to be Perpendicular to each other , when their meeting forms equal adjacent an- gles ...
... angles have the same vertex , the letter at the vertex always occupies the middle place ; as the angle ACD or DCB . 11. Two straight lines are said to be Perpendicular to each other , when their meeting forms equal adjacent an- gles ...
Page 9
... angles are sometimes called oblique angles . 14. Parallel Lines are such as , A B being in the same plane , cannot ... adjacent to each other ; as the angles BGH , GHC , and also AGH , GHD . Opposite Exterior and Interior Angles ...
... angles are sometimes called oblique angles . 14. Parallel Lines are such as , A B being in the same plane , cannot ... adjacent to each other ; as the angles BGH , GHC , and also AGH , GHD . Opposite Exterior and Interior Angles ...
Page 13
... adjacent angles which one straight line makes by meeting another straight line , are together equal to two right angles . Let the straight line DC meet A B , making the adjacent angles ACD , DCB ; these angles to- gether will be ...
... adjacent angles which one straight line makes by meeting another straight line , are together equal to two right angles . Let the straight line DC meet A B , making the adjacent angles ACD , DCB ; these angles to- gether will be ...
Page 14
... angles ; for their sum is equal to that of the two adjacent angles , BAC , CA F. THEOREM ІІ . 38. If one straight line meets two other straight lines at a common point , making adjacent angles , which together are equal to two right angles ...
... angles ; for their sum is equal to that of the two adjacent angles , BAC , CA F. THEOREM ІІ . 38. If one straight line meets two other straight lines at a common point , making adjacent angles , which together are equal to two right angles ...
Page 30
... angles . E D C B A For each interior angle , together with its adjacent exterior angle , is equal to two right angles ( Theo . I. ) ; hence the sum of all the angles , both inte- rior and exterior , is equal to twice as many right angles ...
... angles . E D C B A For each interior angle , together with its adjacent exterior angle , is equal to two right angles ( Theo . I. ) ; hence the sum of all the angles , both inte- rior and exterior , is equal to twice as many right angles ...
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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.