Quadrant (plane geometry)
The axes of a two-dimensional Cartesian system divide the plane into four infinite regions, called quadrants, each bounded by two half-axes.
These are often numbered from 1st to 4th and denoted by Roman numerals: I (where the signs of the two coordinates are (+,+)), II (−,+), III (−,−), and IV (+,−). When the axes are drawn according to the mathematical custom, the numbering goes counter-clockwise starting from the upper right ("northeast") quadrant.
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Cartesian coordinate system
A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances to the point from two fixed perpendicular directed lines, measured in the same unit of length. Each reference line is called a coordinate axis or just axis of the system, and the point where they meet is its origin, usually at ordered pair (0, 0). The coordinates can also be defined as the positions of the perpendicular projections of the point onto the two axes, expressed as signed distances from the origin.
One can use the same principle to specify the position of any point in three-dimensional space by three Cartesian coordinates, its signed distances to three mutually perpendicular planes (or, equivalently, by its perpendicular projection onto three mutually perpendicular lines). In general, n Cartesian coordinates (an element of real n-space) specify the point in an n-dimensional Euclidean space for any dimension n. These coordinates are equal, up to sign, to distances from the point to n mutually perpendicular hyperplanes.
Circular sector
A circular sector or circle sector (symbol: ⌔), is the portion of a disk enclosed by two radii and an arc, where the smaller area is known as the minor sector and the larger being the major sector. In the diagram, θ is the central angle in radians, 
the radius of the circle, and 
is the arc length of the minor sector.
A sector with the central angle of 180° is called a half-disk and is bounded by a diameter and a semicircle. Sectors with other central angles are sometimes given special names, these include quadrants (90°), sextants (60°) and octants (45°), which come from the sector being one 4th or 6th or 8th part of a full circle, respectively.
The angle formed by connecting the endpoints of the arc to any point on the circumference that is not in the sector is equal to half the central angle.
Area
The total area of a circle is 
. The area of the sector can be obtained by multiplying the circle's area by the ratio of the angle and 
(because the area of the sector is proportional to the its angle, and is the angle for the whole circle, in radians):
Mayday
Mayday is an emergency procedure word used internationally as a distress signal in voice procedure radio communications.
It is used to signal a life-threatening emergency primarily by aviators and mariners, but in some countries local organizations such as firefighters, police forces, and transportation organizations also use the term. The call is always given three times in a row ("Mayday Mayday Mayday") to prevent its being mistaken for some similar-sounding phrase under noisy conditions, and to distinguish an actual Mayday call from a message about a Mayday call.
History
The Mayday procedure word was originated in 1923, by Frederick Stanley Mockford (1897–1962). A senior radio officer at Croydon Airport in London, Mockford was asked to think of a word that would indicate distress and would easily be understood by all pilots and ground staff in an emergency. Since much of the traffic at the time was between Croydon and Le Bourget Airport in Paris, he proposed the word "Mayday" from the French "m’aider" (Translates to: "help me").
¡Mayday!
¡Mayday! is an American hip hop group from Miami, Florida. The group consists of rappers Bernz and Ben Miller (aka Wrekonize) along with producer, keyboard player and guitarist Ken Preiser (aka Plex Luthor), percussionist Andrews Mujica (aka NonMS), drummer Terrel (aka L T Hopkins), and bassist Gianni Perocapi (aka Gianni Cash). The band is currently signed to Tech N9ne's Strange Music label.
Career
Early days (2006-2011)
The band is known for its Miami-underground hit "Quicksand", which earned them a deal with SouthBeat Records, and their first single and 2006 music video "Groundhog Day", featuring Cee-Lo Green (directed by Jokes) which received over 2 million views on the online video site YouTube within only a day of being added. Lil Wayne worked with the group for two unofficial videos; both videos - Da Da Da and Get a Life, were filmed on the roof of a building in the middle of the day, with spectators apparently attending a free concert.
Signing to Strange Music (2011-present)
Mayday (Bump of Chicken song)
"Mayday" (メーデー) is the fourteenth single by Bump of Chicken, released on October 24, 2007. The title track is from the album Orbital Period. The single peaked at #2 on the Oricon Weekly Charts, behind "Hana no Na" (花の名), which was released on the same day. The B-side is a remix of Glass no Blues from the album Flame Vein.
Track listing
Personnel
Chart performance
References
External links
Podcasts:
