17 terms

# 5th grade Unit 4 Math - Positively Perfect Plane Figures

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area
the number of square units needed to cover a surface
square units (sq.units)
a unit of area with dimensions 1 unit x 1 unit
formula
a set of symbols that expresses a mathematical rule
tiling
a repeating pattern of closed figures that covers a surface with no gaps and no overlaps
polygon
a plane shape having 3 or more straight side
regular polygon
polygon with all sides and all angles equal
irregular polygon
a polygon with all sides and all angles not equal
parallelogram
a quadrilateral whose opposite sides are parallel and congruent
congruence
having the same size and shape
face
the side of a three dimensional figure
edge
the line made where two or more faces of a solid figure meet
vertex (vertices)
the point where two or more rays meet; the point of intersection of 2 sides of a polygon; the point of intersection of three or more edges of a solid figure; the top point of a cone
angle
a figure formed by two rays that meet at a common endpoint
circumference
the distance around a circle
diameter
a line segment passing through the center of a circle with both ends touching the circumference