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49 Cards in this Set
- Front
- Back
The distance around a closed figure.
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perimeter
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Of two rays that form an angle, the one that stays fixed in place while the terminal ray swings out from it.
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initial ray
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A 2-dimensional figure that does not start and end at the same point.
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open figure
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All the points between the rays of an angle.
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interior (of an angle)
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A triangle with two congruent sides.
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isosceles triangle
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The point that is an equal distance from every point on a circle.
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center
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A unit for measuring area.
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square unit
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An angle that has a measure of less than 90 degrees.
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acute angle
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An angle that has a measure of exactly 180 degrees.
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straight angle
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A 2-dimensional figure that starts and ends at the same point.
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closed figure
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A closed 2-dimensional figure with sides that are line segments. The sides do not cross each other.
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polygon
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A closed, curved 2-dimensional figure having all points an equal distance from the center.
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circle
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An exact location in space.
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point
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The distance around a circle.
It is about 3 times the length of the diameter. |
circumference
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A part of a line that has one endpoint and continues in one direction without end.
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ray
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A number expressed using a decimal point.
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decimal
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A line segment that connects a point on a cirle with the center.
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radius
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An angle formed by two radii of a circle.
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central angle
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An angle that has a measure of exactly 90 degrees.
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right angle
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A point at the end of a ray or a line segment.
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endpoint
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Of two rays that form an angle, the one that opens out from the initial ray.
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terminal ray
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The number by which a dividend is divided.
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divisor
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An angle that has a measure greater than 90 degrees but less than 180 degrees.
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obtuse angle
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Another name for mean.
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average
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The number of cubic units that fit inside a 3-dimensional figure.
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volume
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The number that is to be raised to a given power.
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base
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A polygon whose sides and angles are not all of the same lengths and measures.
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irregular polygon
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A figure formed by two rays
(sides) with the same endpoint (vertex). |
angle
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Lines that meet or cross at a common point.
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intersecting lines
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All points that are not on the ray or in the interior of an angle.
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exterior (of an angle)
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The ratio of the circumference of a circle to its diameter (about 3.14 or 22/7).
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pi
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A rule that is used to tell whether one number is divisible by another.
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divisibility rule
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A polygon with five sides and five angles.
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pentagon
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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.
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division
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An operation that tells how many in all when equal groups are combined.
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multiplication
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The number of square units needed to cover a region or figure.
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area
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The common point of the two rays of an angle, two sides of a polygon, or three or more edges of a 3-dimensional figure.
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vertex
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One number is divisible by another if the remainder is 0 after dividing.
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divisible by
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An instrument used to draw or measure angles.
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protractor
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A unit used to measure angles.
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degree
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A part of a line between two endpoints.
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line segment
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A chord that passes through the center of a circle.
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diameter
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In division, the number left after the quotient is found.
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remainder
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A line segment that connects two points on a circle.
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chord
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Lines in the same plane that never intersect.
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parallel lines
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The result of division.
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quotient
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A straight path that goes in two directions without end.
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line
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Any lines in space that do not intersect and are not parallel.
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skew lines
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These are lines that cross each other at right angles.
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perpendicular lines
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