| When a cube is rotated about its main
diagonal, describe the region wiped out.
程式碼
|
|
| When a cube is rotated about its main
diagonal, describe the region wiped out.
程式碼
|
|
| Construct one-half of the tangent cone of a
sphere.
程式碼 |
|
| Given three spheres S1, S2,
S3, let P1, P2, P3 be the
points of contact of one common tangent plane of the spheres, and Q1,
Q2, Q3 the points of contact of the other
common tangent plane of the spheres. Show that the lines P1P2
and Q1Q2, meet at a point R12, the lines
P2P3 and Q2Q3 meet at a point
R23, the lines P3P1, Q3Q1meet
at a point R31, and that the points R12, R23
and R31lie on a straight line.
程式碼 |
|
| Construct a surface which appears as a
triangle along the x-axis
程式碼
|
|
| Construct this pattern form by line segments
joining [cos(t),0] with [0,sin(t)] as t ranges over the interval [0,2p].
程式碼 |
|
| Construct this pattern:
程式碼 |
|