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Topic 5 Vocabulary

TermDefinition
angle An angle is formed wherever two lines, line segments, or rays intersect.
area The measurement of the inside of a two-dimensional figure. The number of square units needed to cover a two- dimensional figure.
area model A rectangular diagram used to model multiplication and division of numbers.
Associative Property of Multiplication Factors can be regrouped and the product remains the same.
Commutative Property of Multiplication Numbers can be multiplied in any order and the product remains the same.
composite figures A two- or three- dimensional figure that can be decomposed into smaller figures.
Distributive Property of Multiplication A multiplication fact can be broken apart into the sum of two other multiplication facts.
dividend A quantity that is to be divided.
divisor A number by which another number is divided.
equation A number sentence that uses an equal sign (=) to show that the value on its left side is the same as the value on its right side.
expression A mathematical phrase that does not contain an equal sign (=) or an inequality symbol (≠)
factors The numbers multiplied together to find a product.
formula An equation that uses symbols to relate two or more quantities.
intersecting lines Lines that cross at one point.
line A straight path that extends infinitely in both directions. Represented in diagrams as a line with arrowheads at both ends.
line of symmetry A line that divides a figure into two parts with the same shape and size. When the figure is folded along the line of symmetry, the two parts are the same.
line segment A section of a line that has two endpoints
line symmetric A figure that can be folded on a line to form two halves that fit exactly on top of each other.
parallel lines (sides) Lines that never intersect
parallelogram A quadrilateral containing two pairs of parallel sides. A member of the following shape classes: polygons, quadrilaterals, trapezoids. Sub-classes include rectangles, rhombi, and squares.
perimeter The sum of the side lengths of a polygon.
perpendicular lines (sides) Intersecting lines that form right angles/square corners/square angles.
point An exact position often marked by a dot.
polygon A closed two-dimensional figure composed of a least three straight sides and three vertices.
quadrilateral A polygon with exactly four sides and four vertices. Subclasses include trapezoids, parallelograms, rectangles, rhombi, and squares.
ray A part of a line that has one endpoint and continues on forever in one direction
rectangle A quadrilateral containing four right angles and opposite sides are congruent. A member of the following shape classes: polygons, quadrilaterals, trapezoids, and parallelograms
rhombus A quadrilateral containing four equal-length sides. Subclasses include: polygons, quadrilaterals, trapezoids, and parallelograms and square
right angle An angle measuring exactly 90°.
side A line segment forming part of a polygon.
square A quadrilateral with four right angles and four equal sides. A member of the following shape classes: polygons, quadrilaterals, trapezoids, parallelograms, rectangles, rhombuses
square angle/square Where the corners of a polygon make a square
corner A point where two or more lines, line segments, or curves meet or intersect.
square unit A measure of area.
trapezoid A quadrilateral with at least one pair of parallel sides. Subclasses include: parallelogram, rectangles, rhombus, and squares.
triangle A polygon with exactly three sides, three vertices, and three interior angles.
Created by: user-2048586
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