20 Apr
What Is This Shape?
This is just to record a small discovery.
Here are two views of the same 3d shape. What is the shape?
I'll add an answer as a comment in a couple of days.
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I see here 4 square based pyramids on the first floor, and one in the second floor!
April 25th, 2011 at 5:03 amA Sierpinski square-based pyramid, iteration 1.
Yes, indeed.
http://www.cut-the-knot.org/Curriculum/Geometry/Polyhedra/ManyPyramids.shtml
I was at first surprised that projections of same edges produced once concave and then convex polygons depending on the point of view. My initial impression was that there was a mistake somewhere. Had to think of that with closed eyes.
April 25th, 2011 at 7:40 am