The Elements of Euclid |
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Página 14
O draw a straight line at right angles to a given ftraight line , from a given point in the fame . Let AB be a given ftraight line , and C a point given in it ; it is required to draw a ftraight line angles to AB . from the point C at ...
O draw a straight line at right angles to a given ftraight line , from a given point in the fame . Let AB be a given ftraight line , and C a point given in it ; it is required to draw a ftraight line angles to AB . from the point C at ...
Página 28
STRAIGHT lines which are parallel to the fame ftraight line , are parallel to one another . ... Let A be the given point , and BC the given straight line ; it is required to draw a ftraight line thro ' . the point A , parallel to the ...
STRAIGHT lines which are parallel to the fame ftraight line , are parallel to one another . ... Let A be the given point , and BC the given straight line ; it is required to draw a ftraight line thro ' . the point A , parallel to the ...
Página 381
F a straight line be drawn to a given point in a gi- ven straight line , and makes a given angle with it . that ... Let AB be a straight line given in pofition , and C a given point 29 . in it , the ftraight line drawn to C which makes ...
F a straight line be drawn to a given point in a gi- ven straight line , and makes a given angle with it . that ... Let AB be a straight line given in pofition , and C a given point 29 . in it , the ftraight line drawn to C which makes ...
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added alfo alſo altitude angle ABC angle BAC bafe baſe becauſe bifected Book Book XI circle circle ABCD circumference common cone cylinder defcribed Definition demonftrated diameter divided double draw drawn equal equal angles equiangular equimultiples excefs fame fame multiple fecond fegment fhall fhewn fides fimilar firft firſt folid folid angle fore four fourth fquare fquare of BC ftraight line given angle given ftraight line given in fpecies given in pofition given magnitude given ratio greater Greek half join lefs magnitude manner meet oppofite parallel parallelogram perpendicular plane produced PROP Propofition proportionals pyramid reafon rectangle remaining right angles ſphere taken THEOR theſe third thro triangle ABC wherefore whole