.Mzcy.NzI0MA

B.C. is ye. sine of ye. Arch BA. & of ye. Supplement BF. it is also ye. Cosine of ye. Arch GB. EB is ye. Sine of ye. Arch GB. & ye. Cosine of ye. Arches BA. && BF. CA. is ye. Verse Sine of ye. Arch BA. GE is ye. verser Sine of ye. Arch GB; & is yt. part of ye. Diameter contain'd between ye. Sine & ye. Arch.

A tangent is a line touching one end of ye. Arch & drawn without it perpendicular to ye. diameter, till it meet with radius produc'd unclear ye. other End, & ye. radius so produc'd is call'd ye. Secant; thus AB is ye. tangent of ye. Arch AC. & DB is its secant; & ye. line CA. is ye. Chord of ye. Arch CA.