Elements of Geometry |
From inside the book
Results 6-10 of 41
Page 15
... opposite to the side AE , is less than the right angle AEK , opposite to the side AK ( 49 ) . Therefore the angle IKF , equal to the angle AKE , is less than a right angle , and the lines KI , FD , being produced , must meet ( 58 ) . 62 ...
... opposite to the side AE , is less than the right angle AEK , opposite to the side AK ( 49 ) . Therefore the angle IKF , equal to the angle AKE , is less than a right angle , and the lines KI , FD , being produced , must meet ( 58 ) . 62 ...
Page 19
... opposite interior angles B and C ; for , AE being parallel to BC , the part BAE is equal to the angle B , and the other part DAE is equal to the angle C ( 67 ) . THEOREM . 79. The sum of all the interior angles of a polygon is equal to ...
... opposite interior angles B and C ; for , AE being parallel to BC , the part BAE is equal to the angle B , and the other part DAE is equal to the angle C ( 67 ) . THEOREM . 79. The sum of all the interior angles of a polygon is equal to ...
Page 20
... opposite to ADB is equal to the side DC opposite to the equal angle DBC , and likewise the third side AD is equal to the third side BC ; therefore the opposite sides of a parallelogram are equal . Again , from the equality of the same ...
... opposite to ADB is equal to the side DC opposite to the equal angle DBC , and likewise the third side AD is equal to the third side BC ; therefore the opposite sides of a parallelogram are equal . Again , from the equality of the same ...
Page 21
... opposite to the side AB is equal to the angle DBC opposite to the side CD ; consequently the side AD is parallel to BC ( 67 ) . For a similar reason AB is parallel to CD ; there- fore the quadrilateral ABCD is a parallelogram . THEOREM ...
... opposite to the side AB is equal to the angle DBC opposite to the side CD ; consequently the side AD is parallel to BC ( 67 ) . For a similar reason AB is parallel to CD ; there- fore the quadrilateral ABCD is a parallelogram . THEOREM ...
Page 33
... opposite interior angles , CAB , ABC . But , the triangle BAC being isosceles , the angle CAB = ABC ; hence the angle BCE is double of BAC . The angle BCE , having its vertex at the centre , has for its measure the arc BE ; therefore ...
... opposite interior angles , CAB , ABC . But , the triangle BAC being isosceles , the angle CAB = ABC ; hence the angle BCE is double of BAC . The angle BCE , having its vertex at the centre , has for its measure the arc BE ; therefore ...
Other editions - View all
Common terms and phrases
ABC fig adjacent angles altitude angle ACB angle BAD angles equal base ABCD bisect centre chord circ circular sector circumference circumscribed common cone consequently construction convex surface Corollary cube cylinder Demonstration diagonals diameter draw drawn equal and parallel equiangular equilateral equivalent faces figure four right angles frustum Geom gles greater hence homologous sides hypothenuse inclination inscribed circle intersection isosceles join less let fall line AC manner mean proportional measure the half meet multiplied number of sides oblique lines opposite parallelogram parallelopiped perimeter perpendicular plane MN polyedron prism proposition quadrilateral radii radius ratio rectangle regular polygon right angles right-angled triangle Scholium segment semicircumference side BC similar solid angle sphere spherical polygons spherical triangle square described straight line tangent THEOREM three plane angles triangle ABC triangular prism triangular pyramids vertex vertices whence
Popular passages
Page 65 - The square of the hypothenuse is equal to the sum of the squares of the other two sides ; as, 5033 402+302.
Page 21 - 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 ii - Co. of the said district, have deposited in this office the title of a book, the right whereof they claim as proprietors, in the words following, to wit : " Tadeuskund, the Last King of the Lenape. An Historical Tale." In conformity to the Act of the Congress of the United States...
Page 63 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. A D A' Hyp. In triangles ABC and A'B'C', To prove AABC A A'B'C' A'B' x A'C ' Proof. Draw the altitudes BD and B'D'.
Page 22 - CIRCLE is a plane figure bounded by a curved line, all the points of which are equally distant from a point within called the centre; as the figure ADB E.
Page ii - States entitled an act for the encouragement of learning hy securing the copies of maps, charts and books to the author., and proprietors of such copies during the times therein mentioned, and also to an act entitled an act supplementary to an act, entitled an act for the encouragement of learning by securing the copies of maps, charts and books to the authors and proprietors of such copies during the times therein mentioned and extending the benefits thereof to the arts of designing, engraving and...
Page 80 - The perimeters of two regular polygons of the same number of sides, are to each other as their homologous sides, and their areas are to each other as the squares of those sides (Prop.
Page 164 - If two triangles have two sides and the inchtded angle of the one respectively equal to two sides and the included angle of the other, the two triangles are equal in all respects.
Page 24 - In the same circle, or in equal circles, equal arcs are subtended by equal chords ; and, conversely, equal chords subtend equal arcs.
Page 153 - XVII.) ; hence two similar pyramids are to each other as the cubes of their homologous sides.