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Everyday Math Gr 4 Unit 1
Vocabulary for grade 4 Everyday Math Unit 1
12
Mathematics
10/27/2011

Term
 concave (nonconvex) polygon
Definition
 A polygon in which at least one vertex is "pushed in."
Term
 convex polygon
Definition
 A polygon in which all vertices are "pushed outward."
Term
 endpoint
Definition
 A point at the end of a line segment or ray.
Term
 line
Definition
 Informally, a straight path that extends infinitely in opposite directions.
Term
 line segment
Definition
 A straight path joining two points.
Term
 parallelogram
Definition
 A quadrilateral that has two pairs of parallel sides. Opposite sides are equal length. Opposite angles have the same measure.
Term
 polygon
Definition
 A 2-dimensional figure that is made up of three or more line segments joined end to end to make one closed path. The line segments may not cross.
Term
Definition
 A polygon that has four sides and four angles.
Term
 ray
Definition
 A straight path that extends infinitely from its endpoint.
Term
 rhombus
Definition
 A quadrilateral whose sides are all the same length and opposite sides are parallel.
Term
 trapezoid
Definition
 A quadrilateral that has exactly one pair of parallel sides.
Term
 vertex
Definition
 The point where the rays of an angle, the sides of a polygon, or the edges of a polyhedron meet.
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