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What (who) is ruled - definition
Ruled surface
![Ruled surface generated by two [[Bézier curve]]s as directrices (red, green)](https://commons.wikimedia.org/wiki/Special:FilePath/Bez-regelfl.svg?width=200 "Ruled surface generated by two [[Bézier curve]]s as directrices (red, green)")
![hyperbolic towers]] at [[Didcot Power Station]], UK; the surface can be doubly ruled.](https://commons.wikimedia.org/wiki/Special:FilePath/Didcot power station cooling tower zootalures.jpg?width=200 "hyperbolic towers]] at [[Didcot Power Station]], UK; the surface can be doubly ruled.")
![toroidal]] tank, by Jan Bogusławski in [[Ciechanów]], Poland](https://commons.wikimedia.org/wiki/Special:FilePath/Ciechanow water tower.jpg?width=200 "toroidal]] tank, by Jan Bogusławski in [[Ciechanów]], Poland")
![A hyperboloid [[Kobe Port Tower]], [[Kobe]], Japan, with a double ruling.](https://commons.wikimedia.org/wiki/Special:FilePath/Kobe port tower11s3200.jpg?width=200 "A hyperboloid [[Kobe Port Tower]], [[Kobe]], Japan, with a double ruling.")
![Hyperboloid water tower, 1896 in [[Nizhny Novgorod]].](https://commons.wikimedia.org/wiki/Special:FilePath/First Shukhov Tower Nizhny Novgorod 1896.jpg?width=200 "Hyperboloid water tower, 1896 in [[Nizhny Novgorod]].")
![The [[gridshell]] of [[Shukhov Tower]] in Moscow, whose sections are doubly ruled.](https://commons.wikimedia.org/wiki/Special:FilePath/Shukhov tower shabolovka moscow 02.jpg?width=200 "The [[gridshell]] of [[Shukhov Tower]] in Moscow, whose sections are doubly ruled.")
![Torrazzo]].](https://commons.wikimedia.org/wiki/Special:FilePath/Cremona, torrazzo interno 02 scala a chiocciola.JPG?width=200 "Torrazzo]].")
![hyperbolic paraboloid]] roof of [[Warszawa Ochota railway station]] in [[Warsaw]], Poland.](https://commons.wikimedia.org/wiki/Special:FilePath/W-wa Ochota PKP-WKD.jpg?width=200 "hyperbolic paraboloid]] roof of [[Warszawa Ochota railway station]] in [[Warsaw]], Poland.")
![conical hat]].](https://commons.wikimedia.org/wiki/Special:FilePath/Aodai-nonla-crop.jpg?width=200 "conical hat]].")
![Corrugated roof tiles ruled by parallel lines in one direction, and [[sinusoidal]] in the perpendicular direction](https://commons.wikimedia.org/wiki/Special:FilePath/Corrugated-fibro-roofing.jpg?width=200 "Corrugated roof tiles ruled by parallel lines in one direction, and [[sinusoidal]] in the perpendicular direction")
![Construction of a planar surface by ruling ([[screed]]ing) concrete](https://commons.wikimedia.org/wiki/Special:FilePath/US Navy 091022-N-2571C-042 Seabees use a long board to screed wet concrete.jpg?width=200 "Construction of a planar surface by ruling ([[screed]]ing) concrete")
SURFACE THROUGH EVERY POINT OF WHICH RUNS A STRAIGHT LINE WHICH EQUALLY IS ON THE SURFACE
Doubly ruled; Doubly ruled surface; Doubly Ruled Surface; Ruled Surface; Doubly-ruled surface; Ruled algebraic surface; Ruling of a cone
In geometry, a surface is ruled (also called a scroll) if through every point of there is a straight line that lies on . Examples include the plane, the lateral surface of a cylinder or cone, a conical surface with elliptical directrix, the right conoid, the helicoid, and the tangent developable of a smooth curve in space.
Examples of use of ruled
1. Pakistan is ruled and always going to be ruled by military either direct or through proxies.
2. "Nothing is ruled out, nothing is ruled in either," Singh shot back.
3. Nothing can be ruled out; but here are are some objectives to be ruled in.
4. Mehra draws parallels between Indians ruled by the British and Indians ruled by corrupt politicians today.
5. The Supreme Court ruled in this case as it has ruled in the past.