Elements of Geometry: With NotesJ. Souter, 1827 - 208 páginas |
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Página 3
... figure . 12. A polygon is a name used to comprehend every recti- lineal figure , without regard to the number of its sides . The boundary of the figure is called its perimeter . 13. Among polygons , however , are more particularly di ...
... figure . 12. A polygon is a name used to comprehend every recti- lineal figure , without regard to the number of its sides . The boundary of the figure is called its perimeter . 13. Among polygons , however , are more particularly di ...
Página 4
... figure is a trapezium . 21. A rhombus is a rhomboid , two of whose adjacent , sides are equal . 22. A rectangle is a ... figures are equal when , by supposing them to be applied to each other , they would coincide throughout ; and they ...
... figure is a trapezium . 21. A rhombus is a rhomboid , two of whose adjacent , sides are equal . 22. A rectangle is a ... figures are equal when , by supposing them to be applied to each other , they would coincide throughout ; and they ...
Página 16
... . THEOREM . In any polygon the sum of all the angles is equal to twice as many right angles as the figure has sides , all but four right angles . 1 For if from the vertices of the several angles , 16 ELEMENTS OF GEOMETRY .
... . THEOREM . In any polygon the sum of all the angles is equal to twice as many right angles as the figure has sides , all but four right angles . 1 For if from the vertices of the several angles , 16 ELEMENTS OF GEOMETRY .
Página 17
... figure , the polygon will obviously be divided into as many triangles as it has sides . Now , by last proposition , the sum of the angles in each triangle amounts to two right angles , therefore the angles of all the triangles are ...
... figure , the polygon will obviously be divided into as many triangles as it has sides . Now , by last proposition , the sum of the angles in each triangle amounts to two right angles , therefore the angles of all the triangles are ...
Página 18
... figure , which , if considered as an inward angle , must exceed two right angles . The consideration , however , of angles , as greater than two right angles , does not enter into elementary geometry , and is , indeed , at variance with ...
... figure , which , if considered as an inward angle , must exceed two right angles . The consideration , however , of angles , as greater than two right angles , does not enter into elementary geometry , and is , indeed , at variance with ...
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Términos y frases comunes
adjacent angles altitude angle ABC angle ACB angle BAC antecedent base centre chord circ circle circumference circumscribed polygon coincide consequently Prop construction Converse of Prop corollary demonstration described diagonals diameter divided draw equal angles equal Prop equal to AC equimultiples equivalent Euclid exterior angle follows four right angles geometry given straight line gonal greater half hence homologous sides hypothenuse hypothesis included angle inscribed angle inscribed polygon intersect isosceles triangle join Legendre less line drawn lines be drawn magnitudes meet multiple number of sides obtuse opposite angles parallel perimeter perpendicular PROBLEM proportion PROPOSITION XII quadrilateral radii rectangle rectangle contained regular polygon respectively equal rhomboid right angled triangle Scholium side BC similar polygons similar triangles submultiple subtended surface tangent THEOREM three angles tiple triangle ABC vertex VIII
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Página 165 - ... if a straight line, &c. QED PROPOSITION 29. — Theorem. If a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another ; and the exterior angle equal to the interior and opposite upon the same side ; and likewise the two interior angles upon the same side together equal to two right angles.
Página 172 - If a straight line meet two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
Página 30 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line. Let...
Página 185 - FBC ; and because the two sides AB, BD are equal to the two FB, BC, each to each, and the angle DBA equal to the angle FBC; therefore the base AD is equal (i.
Página 86 - IF a straight line be drawn parallel to one of the sides of a triangle, it shall cut the other sides, or those produced, proportionally; and if the sides, or the sides produced, be cut proportionally, the straight line which joins the points of section shall be parallel to the remaining side of the triangle...
Página 142 - To describe an isosceles triangle, having each of the angles at the base double of the third angle.
Página 205 - Let AMB be the enveloped line; then will it be less than the line APDB which envelopes it. We have already said that by the term convex line we understand a line, polygonal, or curve, or partly curve and . partly polygonal, such that a straight line cannot cut it in more than two points.
Página 185 - BK, it is demonstrated that the parallelogram CL is equal to the square HC. Therefore the whole square BDEC is equal to the two squares GB, HC ; and the square BDEC is described upon the straight line BC, and the squares GB, HC upon BA, AC.
Página 105 - And since a radius drawn to the point of contact is perpendicular to the tangent, it follows that the angle included by two tangents, drawn from the same point, is bisected by a line drawn from the centre of the circle to that point ; for this line forms the hypotenuse common to two equal right angled triangles. PROP. XXXVII. THEOR. If from a point without a circle there be drawn two straight lines, one of which cuts the circle, and the other meets it ; if the rectangle...
Página 35 - In any triangle, the square of a side opposite an acute angle is equal to the sum of the squares of the other two sides diminished by twice the product of one of those sides and the projection of the other side upon it.