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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
radius
a line segment with one endpoint at the center of the circle and the other endpoint on the circle
pi
the relationship of the circle's circumference to its diameter, when used in calculations, pi is typically approximated as 3.14