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Vocabulary Lessons 1-35
Saxon Math
25
Mathematics
5th Grade
11/14/2008

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Term
intersect
Definition
to share a point or points
Term
intersecting lines
Definition
lines that cross
Term
oblique lines
Definition
lines in the same plane that are neither parallel nor perpendicular
Term
parallel lines
Definition
lines that stay the same distance apart; lines that do not cross
Term
perpendicular lines
Definition
two lines that intersect at right angles
Term
acute angle
Definition
an angle whose measue is more than 0 degrees and less than 90 degrees
Term
angle
Definition
the opening that is formed when two lines, line segments, or rays intersect
Term
congruent
Definition
having the same size and shape
Term
obtuse angle
Definition
an angle whose measure is more than 90 degrees and less than 180 degrees
Term
plane
Definition
a flat surface that has no boundaries
Term
polygon
Definition
a closed, flat shape with straight sides
Term
quadrilateral
Definition
any four-sided polygon
Term
right angle
Definition
an angle that forms a square corner and measures 90 degrees
Term
side
Definition
a line segment that is part of a polygon
Term
similar
Definition
having the same shape but not necessarily the same size; proportional
Term
straight angle
Definition
an angle that measures 180 degrees and forms a straight line
Term
vertex
Definition
a point of an angle, polygon, or solid where two or more lines meet
Term
exact number
Definition
a number that has not been rounded
Term
round
Definition
to express a calculation or measure to a specific degree of accuracy
Term
round number
Definition
a whole number that ends with one or more zeros
Term
elapsed time
Definition
the differnce between the starting time and ending time
Term
sum
Definition
answer to an addition problem
Term
difference
Definition
answer to a subtraction problem
Term
product
Definition
answer to a multiplication problem
Term
quotient
Definition
answer to a division problem
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