Elements of Geometry and Conic SectionsHarper & brothers, 1861 - 234 Seiten |
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Seite 10
... vertex , and the lines are called the sides of the angle . If there is only one angle at a point , it may be denoted by a letter placed at the vertex , as the angle at A. A But if several angles are at one point , any one of them is ...
... vertex , and the lines are called the sides of the angle . If there is only one angle at a point , it may be denoted by a letter placed at the vertex , as the angle at A. A But if several angles are at one point , any one of them is ...
Seite 11
... vertices of two angles not adjacent to each other . Thus , AC , AD , AE are diagonals . D A E F 19. An equilateral polygon is one which has all its sides equal . An equiangular polygon is one which has all its an- gles equal . 20. Two ...
... vertices of two angles not adjacent to each other . Thus , AC , AD , AE are diagonals . D A E F 19. An equilateral polygon is one which has all its sides equal . An equiangular polygon is one which has all its an- gles equal . 20. Two ...
Seite 20
... vertex ; but in an isos celes triangle , that side is usually regarded as the base , which is not equal to either of the others . PROPOSITION XI . THEOREM ( Converse of Prop . X. ) . If two angles of a triangle are equal to one another ...
... vertex ; but in an isos celes triangle , that side is usually regarded as the base , which is not equal to either of the others . PROPOSITION XI . THEOREM ( Converse of Prop . X. ) . If two angles of a triangle are equal to one another ...
Seite 57
... dicular let fall from the vertex of an angle on the opposite side , taken as a base , or on the base produced . 7. The altitude of a parallelogram is the perpendicular drawn BOOK IV . 57 The Proportions of Figures BOOK IV.
... dicular let fall from the vertex of an angle on the opposite side , taken as a base , or on the base produced . 7. The altitude of a parallelogram is the perpendicular drawn BOOK IV . 57 The Proportions of Figures BOOK IV.
Seite 69
... vertices B and C are in a line par- allel to the base ( Prop . II . , Cor . 2 ) . The triangles ADE , BDE , whose ... vertex is D , having the same altitude , are to each other as their bases . AE , EC ; therefore ADE : DEC :: AE : EC ...
... vertices B and C are in a line par- allel to the base ( Prop . II . , Cor . 2 ) . The triangles ADE , BDE , whose ... vertex is D , having the same altitude , are to each other as their bases . AE , EC ; therefore ADE : DEC :: AE : EC ...
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ABCD AC is equal allel altitude angle ABC angle ACB angle BAC base BCDEF bisected CA² chord circle circumference cone contained convex surface curve described diagonals diameter draw ellipse equal angles equal to AC equally distant equiangular equilateral equivalent exterior angle foci four right angles frustum given point given straight line greater hyperbola hypothenuse inscribed intersect join latus rectum Let ABC lines AC major axis mean proportional measured by half meet number of sides ordinate parabola parallelogram parallelopiped pendicular perimeter perpen perpendicular plane MN principal vertex prism PROPOSITION pyramid quadrant radii radius ratio rectangle regular polygon right angles Prop right-angled triangle Scholium segment side AC similar similar triangles solid angle sphere spherical triangle square subtangent tangent THEOREM triangle ABC vertex vertices
Beliebte Passagen
Seite 27 - If two triangles have two angles and the included side of the one, equal to two angles and the included side of the other, each to each, the two triangles will be equal.
Seite 157 - The sum of the angles of a spherical triangle is greater than two and less than six right angles ; that is, greater than 180° and less than 540°. (gr). If A'B'C' is the polar triangle of ABC...
Seite 60 - Any two rectangles are to each other as the products of their bases by their altitudes.
Seite 63 - IF a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the' rectangle contained by the parts.
Seite 101 - When you have proved that the three angles of every triangle are equal to two right angles...
Seite 10 - CHG; and they are adjacent angles; but when a straight line standing on another straight line makes the adjacent angles equal to one another, each of them is a right angle; and the straight line which stands upon the other is called a perpendicular to it; therefore from the given point C a perpendicular CH has been drawn to the given straight line AB.
Seite 32 - 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.
Seite 22 - 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.
Seite 18 - BC common to the two triangles, which is adjacent to their equal angles ; therefore their other sides shall be equal, each to each, and the third angle of the one to the third angle of the other, (26.
Seite 41 - It follows that either couplet of a proportion may be multiplied or divided by any quantity, and the resulting quantities will be in proportion. And since by...