Lesson #6 title: PART 6 = DESCRIBING and COMPARING SIDES & of REGULAR and IRREGULAR POLYGONS
Date:
THROUGH-LINE: Creation-enjoying
Creation is enjoyed when SIDE lengths and/or INTERIOR  are used to classify triangles and regular & irregular polygons.
OUTCOMES:
1. Demonstrate that the sides of a given regular polygon are of the same length and that the
angles of a regular polygon are of the same measure.
2. Sort a given set of polygons as regular or irregular, and justify the sorting.
MATERIAL NEEDED: highlighters, pencil, blue pen, double scale protractor, calculator, ruler
Example #1: (idea for headings in chart obtained from MsT’s head 2015)
(GR. 5 & 6)
(Grades K to 6)
POLYGON
NAME of REGULAR
POLYGON
Measurement and TYPE
of ONE interior 
(GR6)
~128.6o
(GR6)
(Grades K to 6)
POLYGON
NAME of REGULAR
POLYGON
REGULAR
NONAGON
(GR6)
Measurement and TYPE
of ONE interior 
140o
No picture
Summary: REGULAR POLYGON =
As the NUMBER of SIDES in the regular polygon INCREASES,
the MEASURE of each interior also
because
L6(3)
YOUR TURN 
#1: Measure the four interior angles of each polygon using a protractor. Label the degrees
inside each vertex.
NAME OF POLYGON:
REGULAR or IRREGULAR POLYGON?
SUM of 4 interior 
NAME OF POLYGON:
REGULAR or IRREGULAR POLYGON?
SUM of 4 interior 
NAME OF POLYGON:
REGULAR or IRREGULAR POLYGON?
SUM of 4 interior 
#2: (obtained from Eduguide5, p.256)
NAME the rectangle using the alphabetical letters.
NAME the FOUR line segments that compose this rectangle.
AB is ǁ to
BC is ⊥ to
AD is the same length as
CD is equal to
AD and AB intersect at
L6(4)
#3: (obtained from Eduguide5, p.246)
#4: (obtained from Eduguide5, p.256)
L6(5)
#5: (obtained from Math6 Nov2010)
How many of these 2-D shapes are POLYGONS?
How many of these 2-D shapes are REGULAR POLYGONS?
How many of these 2-D shapes are IRREGULAR POLYGONS?
#6: (obtained from Eduguide6, p.113)
SORT these shapes by listing the alphabet letter in the correct column in the tables. YES,
the same letter may be used more than once.
L6(6)
#7: (obtained from Eduguide6, p.114)
Read each definition. List ALL the polygons that it describes.
a. Polygon with 6 equal sides:
b. Polygon with opposite sides equal and all angles 90o:
c. Polygon with 4 sides and NONE are equal:
d. Polygon with 4 equal sides:
e. Polygon with 3 sides and an interior angle of 115o:
#8: