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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
# Folio - , page id 806933011:0810
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Lec et
its Poines are suppoled ro be reterrea.
LecD B bc called b, and alt rH
ehe Equation will bcy y = b V V V, alu-
= 2VV
D A will be che Lanxent; 2 b) Kalt 1s 4 and 5.
APDCaTS.
1682. there is an Omrectas Mechod For drawin
Tangenes co all Curres, wilen Is ad poremene
OF chis.
erpendicular lo sonn Ladius, 25 C
conches he Cirete buc i CC LbuC.
ter NB, is pexpendicular eo P B, and eo Whiet
elseas above:
ut sivon, at 23 ch.
ac, to any siven Cirole, at cb c.
a
Join che Poine a and che Cesre ot the Circle
by drawins che Line a c. Then wich che Kallius
ac on c, describe anocher Circle; crect a Perpen-
dicur s  t  haet   d
deaW de, currins che former Circle in e: chen ac
beine draun, is the Tangent requirecto
IE noW D BC Greater chan 2 V, che Fangemrmus
be dracon corvards B, it lesser, cowards F, il equ
N. B. In che Acta Fruditorum For Decemiber.
Ddemonstration.
The Line en is a erue Tangent, because perpen.
dicular ro the Radiusce, and ris perpendicularro
TANOENT d a Circle, in Geometry, is a ce, because ee a is a Righe Angle; and ce a, is 
and wot.
Righe Ansle, because ris equal 10 cb d, (WvtICM
vas made (0 by Construction) and ris equal eo
cb d, because che Triansle cb d, is equal co etue
Lllangle aoc, 2s havins cro Sides and one Angle
equal. Wheretore che Ansle eta, Lscesuat Lo The
Riphe Line, as P R dramn wirtour che Circle,
Ansle c b d, wotiie I3 a B R. F. D.
Anocher very expedicious may os dramins a Tangene
0a Cirele, is ihis
Let the Cirele BC R NC, the Point oF Contac
NV, Transser the Radins N C, any ivhere trOm L
donnvards into rhe Posrion R C, (O ThAE R N bC
be equalro R C; then with R C on che CentreR.
Arike a Semicircle, and a Rulerlaid trom C ihro R,
will And che Poine Y; From Wrhence Y N beine
drawn, will be a erue l’angene, because che Angle
FNC bcins in a Semii circte, is a RixHE OHC.
eROPO