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Rare card · Science
Spherical coordinate system, a Rare card
In mathematics, a spherical coordinate system specifies a given point in three-dimensional space by using a distance and two angles as its three coordinates.
- Rarity
- Rare
- Domain
- Science
- ATK
- 75
- DEF
- 57
- Power
- 132
- Wikipedia reads a year
- 290,000
Power 132 (ATK + DEF): stronger than 65 % of WikiCards cards.
Spherical coordinate system quiz: 3 questions
Three questions on the Spherical coordinate system card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
The plane passing through the origin and perpendicular to the polar axis is called the ______ plane.
Answer
reference. The plane passing through the origin and perpendicular to the polar axis is called the reference plane. From the Spherical coordinate system article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Spherical coordinate system. Spherical coordinate system 75 · List of ambassadors of Sweden to Spain 71 · Warner R. Schilling 68 · Kepler-452b 65 ATK in WikiCards.
Which of these Wikipedia articles is read the most in a year?
Answer
Spherical coordinate system. Spherical coordinate system 290,000 · Kepler-452b 220,000 · Yuri Lvov 930 · List of ambassadors of Sweden to Spain 480 Wikipedia reads over a year.
In a duel, each round asks a question like these about the opposing card, with 15 seconds to answer.
The facts on the card
The card carries these facts from its Wikipedia article.
- These are the radial distance, r, along the line connecting the point to a fixed point called the origin. the polar angle, θ, between this radial line and a given polar axis, and the azimuthal angle, φ, which is the angle of rotation of the radial line around the polar axis.
- Once the radius is fixed, the three coordinates, known as a 3-tuple, provide a coordinate system on a sphere, typically called the spherical polar coordinates.
- The plane passing through the origin and perpendicular to the polar axis is called the reference plane.
Why it is Rare
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Spherical coordinate system article was read about 290,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 75 and blocks with 57: each hit it takes is cut by 23 %.
How to get Spherical coordinate system
Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.
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Credits
Text : Wikipedia, Spherical coordinate system (revision), CC BY-SA 4.0. Photo : Andeggs, Public domain, Wikimedia Commons.
