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  2. Cone - Wikipedia

    en.wikipedia.org/wiki/Cone

    The lateral surface area of a right circular cone is = where is the radius of the circle at the bottom of the cone and is the slant height of the cone. [4] The surface area of the bottom circle of a cone is the same as for any circle, . Thus, the total surface area of a right circular cone can be expressed as each of the following:

  3. Tholos (architecture) - Wikipedia

    en.wikipedia.org/wiki/Tholos_(architecture)

    A tholos (pl.: tholoi; from Ancient Greek θόλος, meaning "conical roof" [1] or "dome"), in Latin tholus (pl.: tholi), is a form of building that was widely used in the classical world. It is a round structure with a circular wall and a roof, usually built upon a couple of steps (a podium), and often with a ring of columns supporting a ...

  4. Conical roof - Wikipedia

    en.wikipedia.org/wiki/Conical_roof

    In this case the cone roof was surrounded by a defensive wall, a parapet or a battlement. Such conical roofs were usually constructed using a timber-framed support structure covered with slate; more rarely they were made of masonry. A small circular turret or tourelle with a conical roof is called a pepperpot or pepperbox turret. [3]

  5. Conic section - Wikipedia

    en.wikipedia.org/wiki/Conic_section

    A conic is the curve obtained as the intersection of a plane, called the cutting plane, with the surface of a double cone (a cone with two nappes).It is usually assumed that the cone is a right circular cone for the purpose of easy description, but this is not required; any double cone with some circular cross-section will suffice.

  6. Roundhouse (dwelling) - Wikipedia

    en.wikipedia.org/wiki/Roundhouse_(dwelling)

    Reconstructed crannog on Loch Tay, Scotland. A roundhouse is a type of house with a circular plan, usually with a conical roof. In the later part of the 20th century, modern designs of roundhouse eco-buildings were constructed with materials such as cob, cordwood or straw bale walls and reciprocal frame green roofs.

  7. Conical surface - Wikipedia

    en.wikipedia.org/wiki/Conical_surface

    An elliptic cone, a special case of a conical surface, shown truncated for simplicity In geometry , a conical surface is an unbounded three-dimensional surface formed from the union of infinite lines that pass through a fixed point and a space curve .

  8. African round hut - Wikipedia

    en.wikipedia.org/wiki/African_round_hut

    The African round hut known in literature as cone on cylinder or cone on drum hut. The hut has different names in various African languages. It is constructed usually with a conical foundation and peaked thatched roof. It is most commonly made out of mud and its roof is often made with grass and with local materials.

  9. List of map projections - Wikipedia

    en.wikipedia.org/wiki/List_of_map_projections

    Boundary is a circle. All parallels and meridians are circular arcs. Usually clipped near 80°N/S. Standard world projection of the NGS in 1922–1988. c. 150: Equidistant conic = simple conic: Conic Equidistant Based on Ptolemy's 1st Projection Distances along meridians are conserved, as is distance along one or two standard parallels. [3] 1772