The Elements of EuclidDesilver, Thomas, 1838 - 416 páginas |
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Página 50
... BC , CD : to these equals add the square of BC , and the squares of AB , BC are equal to the square of AC , and ... given rectilineal figure . * Let A be the given rectilineal figure ; it is required to describe a square that shall be ...
... BC , CD : to these equals add the square of BC , and the squares of AB , BC are equal to the square of AC , and ... given rectilineal figure . * Let A be the given rectilineal figure ; it is required to describe a square that shall be ...
Página 70
... given , the circle is described of which it is a segment . Which was to be ... BC , EF ; and because the circles ABC , DEF are equal , the straight lines ... BC is equal ( 4. 1. ) to the base EF ; and because the angle at A is equal to ...
... given , the circle is described of which it is a segment . Which was to be ... BC , EF ; and because the circles ABC , DEF are equal , the straight lines ... BC is equal ( 4. 1. ) to the base EF ; and because the angle at A is equal to ...
Página 72
... BC is equal ( 4. 1. ) to the base EF . Therefore , in equal circles , & c . Q. E. D. PROP . XXX . PROB . To bisect a given circumference , that is , to divide it into two equal parts . Let ADB be the given circumference , it is required ...
... BC is equal ( 4. 1. ) to the base EF . Therefore , in equal circles , & c . Q. E. D. PROP . XXX . PROB . To bisect a given circumference , that is , to divide it into two equal parts . Let ADB be the given circumference , it is required ...
Página 81
... given circle to place a straight line , equal to a given straight line not greater than the diameter of the circle . Let ABC be the given circle , and D the given straight line , not greater than the diameter of the circle . Draw BC the ...
... given circle to place a straight line , equal to a given straight line not greater than the diameter of the circle . Let ABC be the given circle , and D the given straight line , not greater than the diameter of the circle . Draw BC the ...
Página 83
... BC , CA : and because the angle EBD is equal to the angle FBD , for the angle ABC is bisected by BD , and that the ... given triangle . * C Let the given triangle be ABC ; it is required to describe a circle about ABC . Bisect ( 10. 1 ...
... BC , CA : and because the angle EBD is equal to the angle FBD , for the angle ABC is bisected by BD , and that the ... given triangle . * C Let the given triangle be ABC ; it is required to describe a circle about ABC . Bisect ( 10. 1 ...
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Términos y frases comunes
altitude angle ABC angle BAC base BC BC is equal BC is given bisected centre circle ABCD circumference cone cylinder demonstrated described diameter draw drawn equal angles equiangular equimultiples Euclid ex æquali excess fore given angle given in magnitude given in position given in species given magnitude given ratio given straight line gles gnomon greater join less Let ABC multiple parallel parallelogram parallelogram AC perpendicular point F polygon prism proportionals proposition pyramid Q. E. D. PROP radius ratio of AE rectangle CB rectangle contained rectilineal figure remaining angle right angles segment sides BA similar sine solid angle solid parallelopiped square of AC square of BC straight line AB straight line BC tangent THEOR triangle ABC triplicate ratio vertex wherefore
Pasajes populares
Página 34 - 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. Let the straight line AB be divided into any two parts at the point C : the squares of AB, BC shall be equal to twice the rectangle AB, BC, together with the square of AC.
Página 143 - 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 63 - 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 246 - Again ; the mathematical postulate, that " things which are equal to the same are equal to one another," is similar to the form of the syllogism in logic, which unites things agreeing in the middle term.
Página 9 - If one side of a triangle be produced, the exterior angle is greater than either of the interior opposite angles.
Página 119 - 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.
Página 19 - 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.
Página 12 - To construct a triangle of which the sides shall be equal to three given straight lines ; but any two whatever of these lines must be greater than the third (20.
Página 78 - 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 131 - ... rectilineal figures are to one another in the duplicate ratio of their homologous sides.