Download • An obtuse angle has a complement. • A straight angle has a

Warm-Up
Exercises
Bell Work
Tell whether the statement is always, sometimes, or never true.
An obtuse angle has a complement.
A straight angle has a complement.
An angle has a supplement.
The complement of an acute angle is an acute
angle.
• The supplement of an acute angle is an obtuse
angle.
•
•
•
•
Warm-Up
Exercises
Notes
• Polygon
• Convex
• Concave
Warm-Up
Exercises
Notes
Number of
Sides
Type of
Polygon
3
Triangle
4
Quadrilateral
5
Pentagon
6
Hexagon
7
Heptagon
8
Octagon
9
Nonagon
10
Decagon
12
Dodecagon
n
n-gon
Warm-Up
Exercises
Notes
• Equilateral Polygon
• Equiangular Polygon
• Regular Polygon
Warm-Up1Exercises
EXAMPLE
Identify polygons
Tell whether the figure is a polygon and whether it is
convex or concave.
a.
b.
c.
d.
Warm-Up2Exercises
EXAMPLE
Classify polygons
Classify the polygon by the number of sides. Tell
whether the polygon is equilateral, equiangular, or
regular. Explain your reasoning.
a.
b.
Warm-Up2Exercises
EXAMPLE
Classify polygons
Classify the polygon by the number of sides. Tell
whether the polygon is equilateral, equiangular, or
regular. Explain your reasoning.
c.
Warm-Up
Exercises
GUIDED
PRACTICE
1.
for Examples 1 and 2
Sketch an example of a convex heptagon and
an example of a concave heptagon.
Warm-Up
Exercises
GUIDED
PRACTICE
for Examples 1 and 2
2. Classify the polygon shown at the right by
the number of sides. Explain how you know
that the sides of the polygon are congruent
and that the angles of the polygon
are congruent.
Warm-Up3Exercises
EXAMPLE
Find side lengths
ALGEBRA A table is shaped
like a regular hexagon.The
expressions shown represent
side lengths of the hexagonal
table. Find the length of a side.
Warm-Up
Exercises
GUIDED
PRACTICE
for Example 3
3. The expressions 8y° and ( 9y – 15 )° represent the
measures of two of the angles in the table in
Example 3. Find the measure of an angle.
Warm-Up
Exercises
For Tomorrow
Homework
1.6 (pg.44-46) # 3,5,8,11,13,16,25,33-36