Philosophiae naturalis principia mathematica . producatur P£,&: in eacapiatur QK in ea ratione ad PQjpiamhabet B C ad A B. Capiatur autcm QJv ad eas partes pun&i (9_ut literarum P, Q_ , K idem iit ordo circularis atqi literarum A>B, C: centroq-, K Sc intervallo defcribatur circulus quartus F-Nc fecans circulum tertium F Vlinc. Jungatur Fc fecans cir-culum primum in a &. fecundum in b. Agantur a G, & H, c I, &figurse<*£c F G HI iimilis conftituatur rigura^BC/g£-/: Erkq;Trapezium/^/?/ illud ipfum ouod conftituere oportuit. Seccnt enim circuli duo primi F S G, FTH fe mutuo in
Philosophiae naturalis principia mathematica . producatur P£,&: in eacapiatur QK in ea ratione ad PQjpiamhabet B C ad A B. Capiatur autcm QJv ad eas partes pun&i (9_ut literarum P, Q_ , K idem iit ordo circularis atqi literarum A>B, C: centroq-, K Sc intervallo defcribatur circulus quartus F-Nc fecans circulum tertium F Vlinc. Jungatur Fc fecans cir-culum primum in a &. fecundum in b. Agantur a G, & H, c I, &figurse<*£c F G HI iimilis conftituatur rigura^BC/g£-/: Erkq;Trapezium/^/?/ illud ipfum ouod conftituere oportuit. Seccnt enim circuli duo primi F S G, FTH fe mutuo in P Ky &K, KKy aK,bK,cK & producatur gjPad O 2 L. C I0° ] L. Anguli ad circumferentiasF^K, EbKy EcK funt femiflesangulorum F P K, FOJC, FRICad centra, adeoq- angulorumillornm dimidiis LPK^ LQJf, LKK aequales» Eft ergo figuraPQKK figurae abcK sequiangula 8c fimilis, & propterea ab eftad bc utf Qjid QK, id eft ut ABad BC. Angulis infuper F-aG} FbWy EcIxqi\znturfAgyfBh,fCi per conftru&ionem. VE
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