The number of unit cubes or parts of unit cubes that can be fit into a solid.
Also called volume.
Name given to the plane containing points identified as ordered pairs
of real numbers. Also called coordinate plane.
of a circle
The given point from
which the set of points of the circle are all at the same distance.
point on this circle is the same distance away from the center point,"C".
of a regular polygon
The point equidistant from the vertices.
of a sphere
The given point from which the set of points of the sphere are all the
point on this sphere is
the same distance away from its center point, "C".
For a rotation-symmetric figure, the center of a rotation that maps the
figure onto itself.
A prefix meaning 1/100.
1/100 of a meter.
angle of a circle
An angle with its vertex at the center of the circle.
A is a central angle of this circle because its vertex is the center
of a triangle
The point at which all medians of a triangle intersect.
median is a segment that connects a vertex with the midpoint of the
opposite side. When you draw all these medians, they will intersect
at the centroid.
The centroid is also the center of gravity. So any triangle
will balance perfectly on the tip of a pin at its centroid point.
Give it a try. It's really cool.
An event with a probability of 1.
A segment whose endpoints are on a given circle.
The set of points in a plane that are equidistant from a given point known
as its center.
It's important to remember that a circle is only the points
on the border. Any point on the inside of this border is in the
interior of the circle and is part of what we call the circular
graph in which information is represented using a circle that is cut into
sectors to show values of a particular category. Also called a pie
The "circling back" that sometimes occurs when one tries to
define basic terms; returning to the word which one is trying to define.
perimeter of a circle, which is found by multiplying its diameter times
A circle that is drawn around the outside of a triangle and contains all
the vertices of the triangle. A circle is circumscribed about a polygon
if each vertex of the polygon lies on the circle.
The direction around a circle in which the hands on a clock usually move.
The orientation "walking" around a figure keeping its interior
to the right.
direction in which the hands move on a nondigital clock, designated by
a negative magnitude.
The number by which a certain variable in a term is multiplied.
Ex: 3xy (the 3 is
To occupy the same position.
Lines that contain exactly the same points. We like to think that they
lie on top of each other.
Points that lie on the same line.
A vertical line of objects in a rectangular array.
A multiple of all the denominators in a problem.
Given 1/2, 1/3, 1/4 one common denominator would be 12,
because 2, 3, & 4 all divide into 12 evenly.
24, 36, 48 etc. would
also be common denominators but 12 is used most often because it is
the smallest, or "least common denominator", and thus is easier
to work with.
A line which is tangent to two or more distinct circles.
Property of Addition
For any numbers a
a+ b = b + a. Notice the positions of the numbers switch, but the
quantities are still equal.
3 +4 = 4 + 3
Property of Multiplication
For any numbers a and b:
ab = ba. Notice the positions of the numbers switch, but the quantities
are still equal.
5 x 6 = 6 x 5
30 = 30
Model for Subtraction
y is how much more x is than y.
An instrument for drawing circles.
Two angles the sum of whose measures is 90.
Any positive integer exactly divisible by one or more positive integers
other than itself and 1.
6 is a composite number because 2 & 3 divide it evenly as well as
do 6 & 1.
Two or more circles that lie in the same plane and have the same center.
The "then" clause of a condition. The result of a deduction
in a proof. Also called consequent.
Two or more lines that have a point in common.
A statement of the form If... Then....
If a quadrilateral
has four equal sides then it is a rhombus.
The surface of a conic solid whose base is a circle.
A transformation that is a reflection or composite of reflections; also
called an isometry.
Figures with the same size and shape. Figures which are the image of each
other under a reflection, rotation, or translation, or combination of
The set of points between a given region (its base), together with the
vertex and the base.
The boundary of a conic solid.
An educated guess or opinion.
In a polygon, two angles whose vertices are endpoints of the same side.
In a polygon, two sides with an endpoint in common.
In a polygon, endpoints of a side.
The "then" clause of a conditional, also called the conclusion.
A drawing which is made using only an unmarked straightedge and a compass
following certain prescribed rules.
A figure made up of points with no space between them.
A size change with a magnitude between 0 and 1.
A situation in which there exist contradictory statement(s).
Two statements that cannot both be true at the same time.
A conditional resulting from negating and switching the antecedent and
consequent of the original conditional.
A general location for a figure on a coordinate plane in which its key
points are described with the fewest possible variables.
The conditional statement formed by switching the antecedent and consequent
of a given conditional.
factor by which one unit can be converted to another.
polygon in which no diagonals lie outside the polygon.
set in which every segment that connects points of the set lie entirely
in the set.
The number or numbers associated with the location of a point on a line,
a plane, or in space.
A pair of perpendicular coordinatized lines in a plane that intersect
at the point with coordinate 0; three mutually perpendicular coordinatized
lines in space that are concurrent at the point with coordinate 0.
Displaying points as ordered pairs of numbers.
Name given to the plane containing points identified as ordered pairs
of real numbers. Also called cartesian plane.
A line on which every point is identified with exactly one number and
every number is identified with a point on the line.
Figures that lie in the same plane.
A theorem that is easily proven from another theorem.
pair of angles in similar locations in relation to a transversal intersecting
In this example we see
four sets of corresponding angles.
1&5, 2&6, 3&7, 4&8
If the lines cut by the
transversal are parallel, all correspondig angles will be congruent.
Angles or sides that are images of each other under a transformation.
Any pair of sides in the same relative positions in two similar figures.
The segment stretching from A to B correspondS to the segment stretching
from D to E.
of an angle
The ratio leg adjacent to the angle divided by the hypotenuse in a right
triangle. Abbreviated cos.
A number of particular things.
The direction around a circle opposite from that in which the hands of
a clock move.
orientation "walking" around a figure keeping its interior to
The direction opposite that which the hands move on a nondigital clock,
designated by a positive magnitude.
A specific case of a conditional for which the antecedent is true
but the consequent is false. An example which shows a conjecture
to be false.
name of the particular things being tallied in a count.
Ex: I have 5 dollars. ( The count is 5, and the counting unit
three-dimensional figure with six faces, each face being a square
A real number x is the cube root of a real number y, written
and only if x cubed= y. ex:
for measuring volume.
The surface of a cylindric solid whose base is a circle.
The set of points between a region (its base) and its translation image
in space, including the region and its image.