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  2. Straightedge and compass construction - Wikipedia

    en.wikipedia.org/wiki/Straightedge_and_compass...

    A regular n-gon has a solid construction if and only if n=2 a 3 b m where a and b are some non-negative integers and m is a product of zero or more distinct Pierpont primes (primes of the form 2 r 3 s +1). Therefore, regular n-gon admits a solid, but not planar, construction if and only if n is in the sequence

  3. Solid geometry - Wikipedia

    en.wikipedia.org/wiki/Solid_geometry

    A solid figure is the region of 3D space bounded by a two-dimensional closed surface; for example, a solid ball consists of a sphere and its interior. Solid geometry deals with the measurements of volumes of various solids, including pyramids , prisms (and other polyhedrons ), cubes , cylinders , cones (and truncated cones ).

  4. Elementary mathematics - Wikipedia

    en.wikipedia.org/wiki/Elementary_mathematics

    Two-dimensional geometry is a branch of mathematics concerned with questions of shape, size, and relative position of two-dimensional figures. Basic topics in elementary mathematics include polygons, circles, perimeter and areas.

  5. Sphericon - Wikipedia

    en.wikipedia.org/wiki/Sphericon

    In solid geometry, the sphericon is a solid that has a continuous developable surface with two congruent, semi-circular edges, and four vertices that define a square. It is a member of a special family of rollers that, while being rolled on a flat surface, bring all the points of their surface to contact with the surface they are rolling on.

  6. Prismatoid - Wikipedia

    en.wikipedia.org/wiki/Prismatoid

    If the areas of the two parallel faces are A 1 and A 3, the cross-sectional area of the intersection of the prismatoid with a plane midway between the two parallel faces is A 2, and the height (the distance between the two parallel faces) is h, then the volume of the prismatoid is given by [3] = (+ +).

  7. Dick Van Dyke, 98, Says He's 'Not Afraid' of Dying: 'I'm ...

    www.aol.com/dick-van-dyke-98-says-150000707.html

    Dick Van Dyke knows he won't be around forever, but when death comes, he won't be afraid.. The legendary entertainer, 98, stars in Coldplay's latest music video for their song, "All My Love," and ...

  8. Surface of constant width - Wikipedia

    en.wikipedia.org/wiki/Surface_of_constant_width

    In geometry, a surface of constant width is a convex form whose width, measured by the distance between two opposite parallel planes touching its boundary, is the same regardless of the direction of those two parallel planes.

  9. Matthew McConaughey Opens Up About His ‘Small Town ... - AOL

    www.aol.com/matthew-mcconaughey-opens-small-town...

    Matthew McConaughey is looking back on some of the more unique facets of his "small town" upbringing. “I was born in a little small town, Uvalde.” the award-winning actor, 55, told tennis pro ...

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