Elementi della geometria piana e solida e della trigonometria : opera postuma
Elementi della geometria piana e solida e della trigonometria is an 1755 Italian geometry textbook by Eustachio Manfredi, published posthumously by Lelio dalla Volpe, aimed at students of plane and solid geometry and trigonometry. The pictures are plates of engraved geometric constructions: circles with inscribed triangles, polygons, tangent arcs and dividing lines, drawn in fine black line with lettered points and figure numbers. A designer could take from them a precise, diagrammatic vocabulary of construction lines, letter labels and radial symmetry for geometric patterns.
