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za3raan
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Homework Statement
(a) Show that the four points r1 = (1, 0, 1), r2 = (4, 3, 5), r3 = (6, 4, 6) and
r4 = (3, 1, 2) are coplanar and the vertices of a parallelogram. Let S
be the closed planar region given by the interior and boundary of this
parallelogram. An arbitrary point of S can be written as the convex linear
combination
[itex]\sum a_{j}r_{j}[/itex] for j= 1 to j=4 [itex]\sum a_{j}=1[/itex] [itex]0<a_{j}<1[/itex]
Show that the vertices, edges and interior of the rectangle R = [0, 1]×[0, 1]
are mapped onto the vertices, edges and interior of S by the linear map
(parametrization) r = r(u, v) : R → S
r = (x, y, z) = (1 + 3u + 2v, 3u + v, 1 + 4u + v), (u, v) ∈ [0, 1] × [0, 1]
Homework Equations
Not sure
The Attempt at a Solution
I've shown that the four points are coplanar and the vertices of a parallelogram, however I really have no idea about the rest. Some guidance would be very much appreciated!
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