. Ioan Henrici Alstedii Scientiarum omnium encyclopædiæ : tomus primus [-quartus] ... . piopugnaculi quadrangulare. 11. .Arx trium latertm & angidorHm nidliusefi pretij. Neque quatuor laterum arx multum valet. Igitur ad latcrum & angulorum eifc debet Qu6 pluriumaurcm eft angulorum,e6eft ad defenfionem coinmodior. Hucpertinct ilkid Gcrraanorum architeiftoriim. ^c nicftrwincfctvii^ fcitcnbas 6o[IiDcrrFbat/ ic twirb ^cr anou-lus V»om Doffwcrcf. Item : Kctn triangulum a:quilaterum if?5uv fortification bicnficf;. 111. I» arce regulari,data midtititdine laterum,qiian- tita
. Ioan Henrici Alstedii Scientiarum omnium encyclopædiæ : tomus primus [-quartus] ... . piopugnaculi quadrangulare. 11. .Arx trium latertm & angidorHm nidliusefi pretij. Neque quatuor laterum arx multum valet. Igitur ad latcrum & angulorum eifc debet Qu6 pluriumaurcm eft angulorum,e6eft ad defenfionem coinmodior. Hucpertinct ilkid Gcrraanorum architeiftoriim. ^c nicftrwincfctvii^ fcitcnbas 6o[IiDcrrFbat/ ic twirb ^cr anou-lus V»om Doffwcrcf. Item : Kctn triangulum a:quilaterum if?5uv fortification bicnficf;. 111. I» arce regulari,data midtititdine laterum,qiian- titas angulorum circiimferentidt, intie- nitur hoc modo. Circultim totum arci circumfcriptum, qui circulus fempuponitiir 560. graduura , diuide per multitudincm laterum , "um a femiciiculo , hoc eft: , a duobus reiSis fubtrahe:quod reftat, erit angulus circumferentix arcis , exeinpli gra-tia, Sit arx E B C. X feptem / Arxttialaterumqualisi Iti arce regulaii quantitas anguloiQ circumfe- teti?quo- modo in> ZAZ Encyclopedi^ Lib. XXXV. ,daturperfeptcm^ eritarcasBC. mcr,fura atiguh B A G : quo dctraao dcduobus triangulo plano quouis, atque adco A B C, fumma angulorumA B C & A C B : quorum angulorum vnufquique clt dimidiuangulicircumfetcntixpcr (huauram. Ergo fimul fumtiex-hibcnt ipfum angulum Ita crgo ci it. B A C VI grad. A B D 64 giad. Similiter A C B totidem. B ADz5 IV. ^amitas fiue proportio laterwn fingnlonimvnnifcHtuque arcii reguUris efi indejimia. Etfi enim Specklim vult effe looo pedum,& Itali 800. pc-dum:tamcnBclga;vaiiant. luxu Specklium talis erit propottio feptem pofiro vno vno latcrc ,etit Scmidiaraeter 1151 pcd. Cortina——? po ped. Facics ? 400 ped. luxra Italoi -ft eiufmodi proportio. 800 ped. Cortin- Gola* Spalla- -r . ,,.-
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