■ T H F FIRST BOOKE OF THE SECTOR 4. CHAP. I. TbiDefcriftion^ the makings andthcgenerall<v[ecfthtSettor. SeStor in Geometrie, is a figure com-prehended of two right lines contain-ing an angle at the center, and of thecircumference aiTumed by them. ThisGeometricaUinftrument hauing two…
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