...r.' i D*f ii, b. 4. n. A 15ook XI. ftraight • line; let this be BF. therefore the three ftraight lines AB, BC, BF are all in one plane, viz. that which paftes thro' AB, BC. and becaufe ABftands at right angles to each of the ftraight lmes BD, BE, it is...

...are, 83.11. Book xL are, fhall be a ftraight » line ; let this be BF : Therefore the three ftraight lines AB, BC, BF are all in one plane, viz. that which paffes through AB, BC ; and becaufe AB (lands at right angles to each of the ftraight lines BD, BE,...

...in which BD and BE are, fliall be a ftraight » line ; let this be BF : therefore the three ftraight lines AB, BC, BF are all in one plane, viz. that which pafies through AB, BC ; and beeaufe AJB ftands at right angles to each of the ftraight lines BD, BE,...

...the common section of which with the plane, in which BD and BE are, Book XI. shall be a straight » line ; let this be BF : therefore the three ' —...lines AB, BC, BF are all in one plane, viz. that which a 3. 11. • passes through AB, BC ; and because AB stands at right angles to each of the straight...

...2. Sup. therefore the three straight lines AB, BC, BF are in one plane, which passes through AB, BC. Because AB stands at right angles to each of the straight lines BD, BE, it is also at right angles'1 b*. 2. Sup. to the plane passing through them, and therefore makes right angles with every...

...with the plane, in which BD and BE are a 3. 11. b. 4.11. c 3. df. II. Rook XI. sliall be a straight» line; let this be BF: therefore the three straight...which passes through AB, BC; and because AB stands gt right angles to each of the straight lines BD, BE, it is also at right angles b to the plane passing...

...the plane in which BD O '8. i. Booi XI. and BE are, shall be a straight* ' line; let this be BF: *~v^ Therefore the three straight lines AB, BC, BF, are...AB stands at right angles to each of the straight '4 Def. 1i. ing through them ; and therefore makes right angles c with b 4.1i. lines BD, BE, it is...

...BC, . tfec common section of which, with the plane in which BD O and BE are, shall be a straight a line ; let this be BF : Therefore the three straight...AB stands at right angles to each of the straight k 4. 11. lines BD, BE, it is also at right angles'* to the plane pas«: s Def. 11. ing through them...

...the common section of which with the plane, in which BD and BE are, shall be a straight (3. 2. Sup.) line ; let this be BF : therefore the three straight...straight lines BD, BE, it is also at right angles (4. 2. Sup.) to the plane passing through them ; and therefore makes right angles with every straight...

...section of which with the plane, in which BD and BE are, •Be* Note. shall be a straight (3. 11.) line; let this be BF: therefore the three straight lines AB, BC, BFare all in one plane, viz. that which passes through AB, BC: and because AB stands at right angles...