Elements of geometry, containing books i. to vi.and portions of books xi. and xii. of Euclid, with exercises and notes, by J.H. Smith |
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Página 8
... double of the same thing , or of equal things , are equal to one another . VII . Things which are halves of the same thing , or of equal things , are equal to one another . VIII . Magnitudes which coincide with one another are equal to ...
... double of the same thing , or of equal things , are equal to one another . VII . Things which are halves of the same thing , or of equal things , are equal to one another . VIII . Magnitudes which coincide with one another are equal to ...
Página 33
... If one side of a triangle be bisected , the sum of the two other sides shall be more than double of the line joining the vertex and the point of bisection . S. E. PROPOSITION XXI . THEOREM . If , from the ends 3 Book I.1 33 FROPOSITION XX .
... If one side of a triangle be bisected , the sum of the two other sides shall be more than double of the line joining the vertex and the point of bisection . S. E. PROPOSITION XXI . THEOREM . If , from the ends 3 Book I.1 33 FROPOSITION XX .
Página 35
... ; and FG = B ; ..a △ KFG has been described as reqd . Q. E. F. Ex . Draw an isosceles triangle having each of the equal sides double of the base . PROPOSITION XXIII . PROBLEM . At a given point in Book I. ] 35 PROPOSITION XXII .
... ; and FG = B ; ..a △ KFG has been described as reqd . Q. E. F. Ex . Draw an isosceles triangle having each of the equal sides double of the base . PROPOSITION XXIII . PROBLEM . At a given point in Book I. ] 35 PROPOSITION XXII .
Página 53
... double of the angle AED . Ex . 4. If the straight lines bisecting the angles at the base of an isosceles triangle be produced to meet ; shew that they will contain an angle equal to an exterior angle at the base of the triangle . Ex . 5 ...
... double of the angle AED . Ex . 4. If the straight lines bisecting the angles at the base of an isosceles triangle be produced to meet ; shew that they will contain an angle equal to an exterior angle at the base of the triangle . Ex . 5 ...
Página 55
... double that of its exterior angles ? Ex . 5. How many sides has an equiangular polygon , four of whose angles are together equal to seven right angles ? PROPOSITION XXXIII . THEOREM . The straight lines which join the extremities of two ...
... double that of its exterior angles ? Ex . 5. How many sides has an equiangular polygon , four of whose angles are together equal to seven right angles ? PROPOSITION XXXIII . THEOREM . The straight lines which join the extremities of two ...
Términos y frases comunes
AB=DE ABCD AC=DF angles equal angular points base BC BC=EF centre chord circumference coincide described diagonals diameter divided draw equal angles equiangular equilateral triangle equimultiples Eucl Euclid exterior angle given circle given line given point given straight line greater than nB Hence hypotenuse inscribed intersect isosceles triangle less Let ABC Let the st lines be drawn magnitudes middle points multiple opposite angles opposite sides parallel parallelogram pentagon perpendicular plane polygon produced Prop prove Q. E. D. Ex Q. E. D. PROPOSITION quadrilateral radius ratio rectangle contained reflex angle rhombus right angles segment shew shewn square subtended sum of sqq tangent THEOREM together=two rt trapezium triangle ABC triangles are equal vertex vertical angle
Pasajes populares
Página 89 - To divide a given straight line into two parts, so that the rectangle contained by the whole, and one of the parts, may be equal to the square of the other part.
Página 168 - IF from any point without a circle two straight lines be drawn, one of which cuts the circle, and the other touches it ; the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, shall be equal to the square of the line which touches it.
Página 7 - If a straight line meets 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 40 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...
Página 23 - To draw a straight line perpendicular to a given straight line of an unlimited length, from a given point without it.
Página 106 - To draw a straight line through a given point parallel to a given straight line. Let A be the given point, and BC the given straight line ; it is required to draw a straight line through the point A, parallel to the straight hue BC.
Página 178 - The angle in a semicircle is a right angle; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.
Página 46 - IF a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another...
Página 285 - Wherefore, in equal circles &c. QED PROPOSITION B. THEOREM If the vertical angle of a triangle be bisected by a straight line which likewise cuts the base, the rectangle contained by the sides of the triangle is equal to the rectangle contained by the segments of the base, together with the square on the straight line which bisects the angle.
Página 91 - In every triangle, the square of the side subtending either of the acute angles is less than the squares of the sides containing that angle, by twice the rectangle contained by either of these sides, and the straight line intercepted between the perpendicular let fall upon it from the opposite angle, and the acute angle.