In this paper we investigate the existence of hyperbolic. Euclidean and spherical structures on cone-manifolds with underlying space 3-sphere and with singular set a given two-bridge knot. For two-bridge knots with 8 crossings we present trigonometric identities involving the length of singular geodesics and cone angles of such cone-manifolds. Then these identities are used to produce... https://macorners.shop/product-category/mason-jar-cup-with-straw/