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angular distance
Angstrom
An Angstrom is equal to one
angle
ten billionth (1 x 10-10) of a
An angle is the amount
of rotation it would take meter. This unit of measure is
named for the Swedish
to put one intersecting
physicist
Anders J. Ångström.
line on top of another.
Angular distance is the measure of an arc (a segment of the
circumference of a circle). Angular distance measures the
arc
proportion of a circle that the arc in question consists of.
An arc is a segment along
Angular distance is expressed in degrees, radians, arc minutes
the circumference of a
(one-sixtieth of a degree), or arc seconds (one-sixtieth of a
circle, or the part of any
minute). For example, latitude is the angular distance north or
curve between two points.
south of the equator measured in degrees, and longitude is the
angular distance east or west of the prime meridian (which
goes through Greenwich, England), measured in degrees.
arithmetic sequence (or
arithmetic progression)
1+1=2
area
7-4=3
The area of a region is the number of square units
contained within the region. For example, the area
of a square with a sides of length s is A = s2 . The
area of a rectangle is A = length*width. The area
of a parallelogram is A = base*height. The area of
a triangle is (1/2)base*height. The area of a . The
area of a circle is A = >πr2
Arithmetic is the
study of addition,
subtraction,
multiplication, and
division.
arithmetic
An arithmetic sequence, also called
an arithmetic progression, is an
The arithmetic mean of a set of
ordered list of numbers where each
numbers (also called the average)
term is obtained by adding (or
is equal to the sum of the numbers
subtracting) a constant amount to the
divided by the number of
previous term. For example, the
numbers. For example, for the data
arithmetic sequence
set {1, 2, 3, 6}, the mean is
0, 2, 4, 6, 8, 10, ...
(1+2+3+6)/4 = 12/4 = 3.
is the sequence of numbers starting
with 0 where the terms increase by 2
in turn.
arithmetic mean