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49 Cards in this Set
 Front
 Back
The distance around a closed figure.

perimeter


Of two rays that form an angle, the one that stays fixed in place while the terminal ray swings out from it.

initial ray


A 2dimensional figure that does not start and end at the same point.

open figure


All the points between the rays of an angle.

interior (of an angle)


A triangle with two congruent sides.

isosceles triangle


The point that is an equal distance from every point on a circle.

center


A unit for measuring area.

square unit


An angle that has a measure of less than 90 degrees.

acute angle


An angle that has a measure of exactly 180 degrees.

straight angle


A 2dimensional figure that starts and ends at the same point.

closed figure


A closed 2dimensional figure with sides that are line segments. The sides do not cross each other.

polygon


A closed, curved 2dimensional figure having all points an equal distance from the center.

circle


An exact location in space.

point


The distance around a circle.
It is about 3 times the length of the diameter. 
circumference


A part of a line that has one endpoint and continues in one direction without end.

ray


A number expressed using a decimal point.

decimal


A line segment that connects a point on a cirle with the center.

radius


An angle formed by two radii of a circle.

central angle


An angle that has a measure of exactly 90 degrees.

right angle


A point at the end of a ray or a line segment.

endpoint


Of two rays that form an angle, the one that opens out from the initial ray.

terminal ray


The number by which a dividend is divided.

divisor


An angle that has a measure greater than 90 degrees but less than 180 degrees.

obtuse angle


Another name for mean.

average


The number of cubic units that fit inside a 3dimensional figure.

volume


The number that is to be raised to a given power.

base


A polygon whose sides and angles are not all of the same lengths and measures.

irregular polygon


A figure formed by two rays
(sides) with the same endpoint (vertex). 
angle


Lines that meet or cross at a common point.

intersecting lines


All points that are not on the ray or in the interior of an angle.

exterior (of an angle)


The ratio of the circumference of a circle to its diameter (about 3.14 or 22/7).

pi


A rule that is used to tell whether one number is divisible by another.

divisibility rule


A polygon with five sides and five angles.

pentagon


An operation on two numbers that tells how many groups or how many in each group. It can also tell how many are left over.

division


An operation that tells how many in all when equal groups are combined.

multiplication


The number of square units needed to cover a region or figure.

area


The common point of the two rays of an angle, two sides of a polygon, or three or more edges of a 3dimensional figure.

vertex


One number is divisible by another if the remainder is 0 after dividing.

divisible by


An instrument used to draw or measure angles.

protractor


A unit used to measure angles.

degree


A part of a line between two endpoints.

line segment


A chord that passes through the center of a circle.

diameter


In division, the number left after the quotient is found.

remainder


A line segment that connects two points on a circle.

chord


Lines in the same plane that never intersect.

parallel lines


The result of division.

quotient


A straight path that goes in two directions without end.

line


Any lines in space that do not intersect and are not parallel.

skew lines


These are lines that cross each other at right angles.

perpendicular lines
