C

** pair
of numbers, representing the distances to two or three perpendicular axes.**

**center: the point that is the same distance from
all the points on a circle. The point that **

**is the same distance from all the points on a sphere. The
point inside an ellipse **

**where the major and the minor axes intersect. The center
of a circle that can be **

**inscribed in a regular polygon.**

**center of mass: centroid.**

**central angle: an angle that has its vertex at the center
of a circle.**

**centroid: the center of mass of an object. The
point where the object would balance if **

**supported by a single support. The point in a triangle
where the three medians intersect.**

**chain rule: dy/dx = dy/du * du/dx.**

**chord: a line segment that connects two points on a curve.**

**circle: the set of points in a plane that are a fixed distance
from a given point.**

**circular functions: same as trigonometric functions.**

**circumcenter: the point in a triangle that is the center
of the circle that can be **

** circumscribed
about the triangle. The intersection of the perpendicular
**

** bisectors
of the triangle.**

**circumference: the distance around a closed curve. The
circumference of a circle is **

** 2* pi*r
where r is the radius of the circle.**

**circumscribed circle: a circle that passes through all of the
vertices of a regular polygon.**

**closed interval: an interval that contains its endpoints.
**

**coefficient: a constant that multiplies a variable. In
Ax + By = C, A and B are coefficients **

** of
x and y.**

**cofunction: the cofunction of a trigonometric function,
f(x), is equal to f(pi/2 - x). The **

** cofunction
of the sine is the cosine. The cofunction of the secant is
the **

** cosecant.
The cofunction of the tangent is the cotangent.**

**collinear: points are collinear if they lie on the same
line.**

**commutative property: a + b = b + a. a*b
= b*a.**

**complementary angles: two angles are complementary if
their sum is 90 degrees.**

**completing the square: the method of adding an expression
to both sides of an equation so **

** that
one side becomes a perfect square trinomial.**

**complex fraction: a fraction that contains a fraction
in its numerator and/or denominator.**

**complex number: the sum of an imaginary number and
a real number written in the form**

*a + bi *or *r*(cos x + *i*sin x).

**component: the components in the vector ( a, b, c)
are a, b, and c.**

**composite function: a function that consists of two functions
arranged in such a way that **

** the
output of one function becomes the input of the other function.**

**composite number: a natural number that is not prime.**

**concave: a figure is concave if a line segment can be
drawn so that it goes in, out, then **

** back
into the figure.**

**conclusion: the part of an if - then statement that follows
the word "then". Consequent.**

**conditional statement: an if - then statement.**

**cone: the union of all line segments that connect a point
and a closed curve in a different **

** plane
from the point.**

**congruent: shapes or angles are congruent if you could
put one on top of the other, and **

** they
would look like just one shape. Equal.**

**conic section: parabola, hyperbola, ellipse, circle. Formed
by the intersection of a plane **

** with
a right circular cone.**

**conjecture: a statement that seems to be true, but
has not yet been proven.**

**conjugate: the conjugate of a complex number is formed
by reversing the sign on the **

** imaginary
part of the number. The conjugate of a + bi is a
- bi.**

**conjunction: a statement that is really two statements
joined by the word AND. Both **

** parts
must be true for the statement to be considered true.**

**consequent: the part of an "if - then" statement
that follows the "then". Conclusion.**

**constant: a value that does not change. **

**continuous: a function is continuous if you can
draw it without lifting your pencil off the **

** paper.
y = f(x) is continuous at a if **

** 1.
f( a) exists. **

** 2. lim
as x--> a f(x) exists. **

** And**

** 3. lim as x--> a of f(x) = f(a).**

**contrapositive: the contrapositive of A-->B is Not
B---->Not A.**

**convergent series: an infinite series that has a finite
sum is called convergent. **

**converse: the statement made by interchanging the
hypothesis and the conclusion of a **

** statement.**

**convex: a set of points such that for any two points
in the set, the line segment that **

** connects
them is also in the set.**

**coordinates: a set of numbers that identifies the
location of a point.**

**coplanar: points that lie within the same plane are called
coplanar.**

**corollary: a statement that can be easily proven once
a theorem is proved.**

**cosecant: csc x = 1/sin x**

**cosine: In a triangle, the cosine of an angle =
(length of the adjacent side)/(hypotenuse)**

**cotangent: cot x = 1/tan x**

**coterminal angles: angles whose measures are 2 kpi
apart.**

**counting numbers: natural numbers. The numbers
you use to count.**

**critical point: the point on a curve where the first derivative
equals zero. Extremum.**

**cube: a solid figure with six square faces.**

**cubic: a polynomial of degree 3.**

**cylinder: the union of all line segments that connect
corresponding points on congruent **

** circles
in parallel planes.**