e. repe⸗ rcbi- entia

cire data luæ-

ren- di. rreæ la- uale: eri- que erit

erit area circuli. velp per ſemidiame- 53

trum multiplica ſemi Pepherin& quotus dat aream⸗ Lel: Mul tiplica

diametrum in totam peripheriamn.

productum divide per 4.

Cognitd circamſerentia, aream explotare: datam circumferentiam- quodra, productum duc in 7. nume-

rum provenientem divide perx 88, quo=

tus dat aream.

F. Sola circuli diameero cognite aream cognoſéere: Quadra diametrum,

duadratum duc in TI. productum di- vide per 14, quotus aperit aream quæ- ſitams,

6, Circuli aream invenires, quaudo nec diamerer, pec eireumferentia eſt nota:

ſit circularis baſis turris a. c. b. k. cu- jus& diameter,& circumferentia ſit ignota, ſitque tantum pars a, c. b. d. acceſſibilis, ſic invenies diametrum, Sexea circumferenrtiam,& ex utra- que aream, Metire chordam a. b. 24. eamque divide bifariam in d., 12.&

C 4 due