19 terms

Terms	Definitions
polygon	A closed shape with straight lines that do not cross.
closed shape	A shape that has a perimeter with no openings.
open shape	A shape that has a perimeter with openings.
side	A The outside straight line between two vertices.
vertex	The point where where two sides meet to make an angle or a corner.
triangle	A polygon with three sides and 3 vertices.
quadrilateral	A polygon with four sides and four vertices.
rectangle	A quadrilateral polygon with opposite sides that are parallel and 4 right angles.
square	A rectangle with four equal sides and four right angles.
congruent figures	Figures that are exactly the same in size and shape.
similar figures	Figures that are the same in shape, but are different in size.
line of symmetry	A line that divides a figure into two sides that mirror each other.
cardinal directions	North, South, East, West.
compass rose	A symbol in a map showing the cardinal directions.
trapezoid	A quadrilateral polygon with one pair of parallel sides.
rhombus	A quadrilateral polygon with 2 pairs of parallel lines that is shaped like a diamond.
pentagon	A polygon with 5 sides and 5 vertices. Penta means 5
hexagon	A polygon with 6 sides and 6 vertices.
octagon	A shape with 8 sides and 8 vertices. Octa means 8.

Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com. Click to see the original works with their full license.

• "polygon" image
• "closed shape" image
• "open shape" image
• "side" image
• "vertex" image
• "triangle" image
• "quadrilateral" image
• "rectangle" image
• "square" image
• "line of symmetry" image
• "rhombus" image

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