作業八

STAR1.GIF (1234 bytes)8-1 Construct the torus using the command "tubeplot".
STAR2.GIF (3021 bytes)8-2 Construct two tori as thus:
STAR1.GIF (1234 bytes)8-3 Construct the torus using the command "plot3d".
STAR2.GIF (3021 bytes)8-4 Construct the torus by pasting two patches as thus:
STAR1.GIF (1234 bytes)8-5 Construct one half of a torus so its cross-section consists of two concentric circles.
STAR2.GIF (3021 bytes)8-6 Construct one half of a torus so its cross-section consists of two disjoint circles.
STAR1.GIF (1234 bytes)8-7 Construct one half of a torus so its cross-section consists of two intersecting circles.
STAR2.GIF (3021 bytes)8-8 Construct one half of a torus so its cross-section consists of two interlocking circles in space.
STAR1.GIF (1234 bytes)8-9 Construct a knot as thus:
STAR2.GIF (3021 bytes)8-11 Construct a twisted torus whose sections are formed by regular triangles: