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2D Shapes and Properties

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					                                          2D Shapes and Properties
                           Name      Examples           Properties
                                                                               Vocabulary
                                                 4 equal sides
                                                 4 right angle corners
                          square                                                   side
                                                                                   angle
                                                 Opposite sides are equal
                                                 4 right angle corners           corner
                         rectangle
                                                                               right angle
                                                 3 straight sides                 equal
                                                 3 corners
                         triangle
                                                                                 straight
                                                 1 curved side                   curved
                                                 Same distance across
                          circle                                                 regular
                                                  (diameter) at any point
                                                                                irregular
                                                 5 straight sides
                                                                               symmetrical
                                                 5 corners
                         pentagon                                            lines of symmetry

                                                 6 straight sides               polygon
                                                 6 corners
                         hexagon                                              quadrilateral
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                    2D Shapes and Properties - Vocabulary
Polygon – any 2D shape with 3 or more straight sides
(poly - many ; gon – angles)
Every polygon has the same number of sides and angles (corners)
                                     Regular polygons have
                                                                                      Polygon prefixes
                                     all sides equal and all
     regular
                                     angles equal.
                                                                                  Make the name of a new polygon by
                                     Polygons are irregular                        adding one of these prefixes to
                                                                                               -agon:
                                     if any sides and/or any
    irregular
                                     angles are not equal.
                                                                                          Pent         5
                                     Reflective symmetry is when the shape
                                     can be divided into two equal halves,
                                                                                          Hex          6
 symmetry/ lines
                                                                                          Hept         7
                                     with one half being a reflection (as if in
                                     a mirror) of the other.
   of symmetry                       Regular polygons have the same number
                                     of lines of symmetry as sides/ angles.               Oct          8
                                     An angle of 90 degrees –                             Non          9
                                     the two sides forming the
   right angle                       angle are perpendicular.                             Dec         10
                                                                                          Dodec       12
                                     Any polygon with 4
                                     sides/ angles.
  quadrilateral
                                     See quadrilaterals mat
                                     for more detail.

				
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