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Get you best paper, cut a circle and fold it so that the circumference falls on a fixed point inside. Repeat, using random folds. Now see the creases. This is how you paper-fold an ellipse.
just some right angles, moving back and forth and stuff
stars / squares
Luigi Guido Grandi born on 1st October 1671 was an Italian monk, mathematician and engineer. He has done a lot of incredible things for math, one of them is studying the rose curve (sin wave plotted in polar coordinates), a curve which has the shape of a petaled flower. He named the rose curve rhodonea.
<b>Curves of Constant Width and Odd-Sided Reuleaux Polygons</b><p>A curve of constant width is a convex, two-dimensional shape that, when rotated inside a square, always makes contact with all four sides.<p>A circle is the most obvious (but somewhat trivial) example. Some non-trivial examples are the odd-sided Reuleaux polygons — the first four of which are shown above.<p>Since they don’t have fixed axes of rotation, curves of constant width (except the circle) have few practical applications. One notable use …
<b>Pyritohedron</b> - <b>Dihedral symmetry and pentiprisms</b><p>A pyritohedron is an irregular dodecahedron composed of identical irregular pentagons. The name “pyritohedron” derives from that fact that a common crystal form in pyrite has this shape. The pyritohedron has a geometric degree of freedom with limiting cases of a cubic convex hull at one limit of colinear edges, and a rhombic dodecahedron as the other limit as 6 edges are degenerated to length zero. The regular dodecahedron represents a special …
The FAA might not know what to do with drones, but UAV technology is moving so fast we're thinking more "when," not "if" the skies will be filled with quadrocopters. To help more people jump into the future, 3D Robotics SVP of Sales and Marketing Colin Guinn joined us at Expand to show off the …