The elements of geometry, in eight books; or, First step in applied logic1874 |
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Αποτελέσματα 1 - 5 από τα 31.
Σελίδα 235
... square is a lozenge the angles of which are equal to one another . Hence , since the four angles of a square are together equal to four right angles [ 4 ] , each one is a right angle ; that is , each side is perpendicular to the two ...
... square is a lozenge the angles of which are equal to one another . Hence , since the four angles of a square are together equal to four right angles [ 4 ] , each one is a right angle ; that is , each side is perpendicular to the two ...
Σελίδα 238
... each other , is a square . THEOREM 32 . Conversely , the quadrangle of which the opposite angles are equal to each other , is a parallelogram . Let ABCD be a quadrangle of which the angle A 238 THE ELEMENTS OF GEOMETRY .
... each other , is a square . THEOREM 32 . Conversely , the quadrangle of which the opposite angles are equal to each other , is a parallelogram . Let ABCD be a quadrangle of which the angle A 238 THE ELEMENTS OF GEOMETRY .
Σελίδα 240
... square form a square . THEOREM 35 . The middle line of the lateral sides of a trapezium , is equal to half the sum of the bases . Let A B and C D be the lateral sides 240 THE ELEMENTS OF GEOMETRY .
... square form a square . THEOREM 35 . The middle line of the lateral sides of a trapezium , is equal to half the sum of the bases . Let A B and C D be the lateral sides 240 THE ELEMENTS OF GEOMETRY .
Σελίδα 260
... square four , axes of symmetry . THEOREM 48 . Two equal polygons may be placed symmetrically to an axis . Let the polygons P and Q be equal to each other , and let the ver tices A ' , B ' , C ' , etc. , of the polygon Q ' be homologous ...
... square four , axes of symmetry . THEOREM 48 . Two equal polygons may be placed symmetrically to an axis . Let the polygons P and Q be equal to each other , and let the ver tices A ' , B ' , C ' , etc. , of the polygon Q ' be homologous ...
Σελίδα 264
... the vertices of a polygon symmetric to their intersection . Scholium . A rectangle , square , or lozenge , is symmetric to the intersection of its diagonals . THEOREM 52 . Two polygons symmetric to a point are 264 THE ELEMENTS OF GEOMETRY .
... the vertices of a polygon symmetric to their intersection . Scholium . A rectangle , square , or lozenge , is symmetric to the intersection of its diagonals . THEOREM 52 . Two polygons symmetric to a point are 264 THE ELEMENTS OF GEOMETRY .
Συχνά εμφανιζόμενοι όροι και φράσεις
A B and C D A B C and D E F adjacent angles adjacent sides altitude angle A B C angle ABC angles formed apothem bisect bisectrix centre angle centre line chord circular segment coincide Const Conversely COROLLARY II diagonals diameter divided equal angles equal circumferences equal to half equally distant equilateral equilateral polygon equivalent Eucl extremities given straight line greater homologous hypothenuse inscribed angle intercepts intersection isosceles trapezium isosceles triangle Let A B C magnitude middle line middle perpendicular middle point parallel parallelogram perimeter plane figure point H point of tangence points of section portions produced quadrangle quantities radii radius reasoning would prove rectangle regular polygon right-angled triangle Scholium segment sides A B square straight angle symmetric points tangent THEOREM transversal trapezium triangle A B C unequal vertex W. W. T. B. D. COROLLARY W. W. T. B. D. Inversely
Δημοφιλή αποσπάσματα
Σελίδα 226 - If two triangles have two angles of the one equal to two angles of the other, each to each, and also one side of the one equal to the corresponding side of the other, the triangles are congruent.
Σελίδα 202 - Therefore all the interior angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 230 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.
Σελίδα 143 - When a straight line standing on another straight line, makes the adjacent angles equal to one another, each of the angles is called a, right angle ; and the straight line which stands on the other is called a perpendicular to it. 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which is less than a right angle. 13. A term or boundary is the extremity of any thing.
Σελίδα 218 - 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.
Σελίδα 202 - The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles.
Σελίδα 268 - 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.
Σελίδα 43 - The projection of a point on a plane is the foot of the perpendicular drawn from the point to the plane.
Σελίδα 335 - Assuming that 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...
Σελίδα 382 - FLC, there -are two angles -of the one equal to two angles of the other, each to each ; and the side FC which is adjacent to the equal...