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2. Candle - Wikipedia

   en.wikipedia.org/wiki/Candle

   A candle in a candle stick Tapers (long thin candles) in a church A memorial candle (yahrtzeit candle) A candle is an ignitable wick embedded in wax, or another flammable solid substance such as tallow, that provides light, and in some cases, a fragrance. A candle can also provide heat or a method of keeping time. Candles have been used for ...

3. Candle wick - Wikipedia

   en.wikipedia.org/wiki/Candle_wick

   Wick of a candle Candle wick in a candle. A candle wick or lamp wick is usually made of braided cotton that holds the flame of a candle or oil lamp. A candle wick works by capillary action, conveying ("wicking") the fuel to the flame. When the liquid fuel, typically melted candle wax, reaches the flame it then vaporizes and combusts.

4. Senna alata - Wikipedia

   en.wikipedia.org/wiki/Senna_alata

   Senna alata is an important medicinal tree, as well as an ornamental flowering plant in the subfamily Caesalpinioideae.It also known as emperor's candlesticks, [1] candle bush, [2] candelabra bush, Christmas candles, [3] empress candle plant, ringworm shrub, [3] or candletree.

5. Ellipse - Wikipedia

   en.wikipedia.org/wiki/Ellipse

   An ellipse (red) obtained as the intersection of a cone with an inclined plane. Ellipse: notations Ellipses: examples with increasing eccentricity. In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant.

6. Ellipsoid - Wikipedia

   en.wikipedia.org/wiki/Ellipsoid

   Hence, it is confocal to the given ellipse and the length of the string is l = 2r x + (a − c). Solving for r x yields r x = ⁠ 1 / 2 ⁠ (l − a + c); furthermore r 2 y = r 2 x − c 2. From the upper diagram we see that S 1 and S 2 are the foci of the ellipse section of the ellipsoid in the xz-plane and that r 2 z = r 2 x − a 2.

7. 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.