A school Euclid, being books i. & ii. of Euclid's Elements, with notes by C. Mansford1874 |
Dentro del libro
Resultados 6-10 de 37
Página 30
... Join AF . The straight line AF shall bi- sect the angle BAC . 3 . Because AD is equal to AE [ Con . ] , and AF is ... joining their vertices will bisect their common base at right angles . [ See fig . to the prop . ] 2. If the triangles ...
... Join AF . The straight line AF shall bi- sect the angle BAC . 3 . Because AD is equal to AE [ Con . ] , and AF is ... joining their vertices will bisect their common base at right angles . [ See fig . to the prop . ] 2. If the triangles ...
Página 32
... join CF. The straight line CF drawn from the given point CA shall be at right angles to the given straight line AB . B Because DC is equal to CE [ Con . ] , and FC is 3 . common to the two triangles DCF , ECF ; the two sides DC , CF are ...
... join CF. The straight line CF drawn from the given point CA shall be at right angles to the given straight line AB . B Because DC is equal to CE [ Con . ] , and FC is 3 . common to the two triangles DCF , ECF ; the two sides DC , CF are ...
Página 33
... join CH . The straight line CH drawn from the given point C shall be perpen- dicular to the given straight line AB . Join CF , CG . Because FH is equal to HG [ Const . ] , and HC is 3 . common to the two triangles FHC , GHC ; the two ...
... join CH . The straight line CH drawn from the given point C shall be perpen- dicular to the given straight line AB . Join CF , CG . Because FH is equal to HG [ Const . ] , and HC is 3 . common to the two triangles FHC , GHC ; the two ...
Página 34
... Join CG , which A shall be perpendicular to AB . Join EG and DG . The proof is identical with exercise 2 to prop . 9 . Ex . From a given point to draw a straight line equally inclined to two given straight lines which cut one another ...
... Join CG , which A shall be perpendicular to AB . Join EG and DG . The proof is identical with exercise 2 to prop . 9 . Ex . From a given point to draw a straight line equally inclined to two given straight lines which cut one another ...
Página 38
... join BE and produce it to F , making EF equal to EB , [ I. 3. ] and join FC . 3 . Because AE is equal to EC , and BE to EF ; [ Const . ] the two sides AE , EB are equal to the two sides CE , EF , each to each ; and the angle AEB is ...
... join BE and produce it to F , making EF equal to EB , [ I. 3. ] and join FC . 3 . Because AE is equal to EC , and BE to EF ; [ Const . ] the two sides AE , EB are equal to the two sides CE , EF , each to each ; and the angle AEB is ...
Otras ediciones - Ver todas
A School Euclid, Being Books I. & II. of Euclid's Elements, with Notes by C ... Euclides Sin vista previa disponible - 2015 |
Términos y frases comunes
AC is equal adjacent angles alternate angles angle ABC angle ACB angle AGH angle BAC angle BCD angle DBA angle EDF angle equal angles are equal axioms base BC bisect centre circle coincide Const diagonals diameter double equal sides equal to BC equal to twice equilateral triangle Euclid EUCLID'S ELEMENTS exterior angle fore four right angles given point given rectilineal angle given straight line gnomon half a right hypotenuse interior and opposite isosceles triangle join Let ABC Let the straight obtuse opposite angle opposite sides parallel to CD parallelogram parallelogram ABCD perpendicular produced prop quadrilateral rectangle AC rectangle contained remaining angle rhombus right angles right-angled triangle shew side BC sides equal square described square on AC THEOREM third angle triangle ABC triangle DEF truths twice the rectangle unequal
Pasajes populares
Página 90 - If a straight line be divided into any two parts, the squares of the whole line, and of one of the parts, are equal to twice the rectangle contained by the whole and that part, together with the square of the other part.
Página 28 - If two triangles have two sides of the one equal to two sides of the...
Página 41 - Any two sides of a triangle are together greater than the third side.
Página 57 - IF a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles; and the three interior angles of every triangle are equal to two right angles.
Página 72 - To describe a parallelogram equal to a given rectilineal figure, and having an angle equal to a given rectilineal angle. Let ABCD be the given rectilineal figure, and E the given rectilineal angle. It is required to describe a parallelogram equal to ABCD, and having an angle equal to E.
Página 75 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.
Página 89 - If a straight line be bisected, and produced to any point ; the rectangle contained by the whole line thus produced, and the part of it produced...
Página 55 - 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 28 - A two triangles, having the two sides AB, AC, equal to the two sides \ DE, DF, each to each, viz: AB to DE, and AC to DF; and also the base BC equal to the base EF.
Página 69 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.