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Exploring and Classifying Polygons
A video store has two membership plans. Plan A costs $15 to join and $2.50
per video. Plan B costs $20 to join and $1.75 per video. How many videos
must a customer rent before plan B is the better deal?
COURSE 1 LESSON 8-5
7 videos
8-5
In Lesson 8-4 You learned To classify triangles by
their angles and their sides.
What You Learned
Review
4.2.6 A.2 Quadrilaterals, including squares,
rectangles, parallelograms, trapezoids, rhombi
4.2.6 A.2 Polygons by number of sides
pg 380-383
Pg 122-123 Daily Notetaking Guide
Materials:
Standards:
Materials
In Lesson 8-5 To identify regular polygons and to
classify quadrilaterals.
What You’ll Learn
Why Learn This?
Signs have shapes to help you recognize them from
distances.
Introduction
8-5
Vocabulary 1 of 2
Polygon – is a closed figure that has three or more
line segments that do not cross.
Regular Polygon – a polygon with all sides
congruent and all angles congruent.
Irregular Polygon – is a polygon with sides that are
not all congruent or angles that are not all
congruent.
Quadrilateral – a polygon with four sides.
Vocabulary
Parallelogram – has two pairs of parallel sides.
Vocabulary 2 of 2
Trapezoid – has exactly one pair of parallel sides.
Rhombus – Parallelogram with four congruent sides.
Vocabulary
Square – parallelogram with four right angles and
four congruent sides.
Rectangle – a parallelogram with four right angles.
Pentagon – a polygon with five sides.
Hexagon – a polygon with six sides.
Octagon – a polygon with eight sides.
Decagon – a polygon with ten sides.
2. Name 2 segments skew to DE.
COURSE 1 LESSON 8-5
Exploring and Classifying Polygons
(For help, go to Lesson 8-1.)
1. Can parallel lines also be skew lines? Explain.
8-5
Check Skills You’ll Need
Vocabulary Review
No; skew lines are not in the same plane. No; skew lines
are not in the same plane.
segments not in the same plane as DE
: CB and GH
Identify each polygon according to the number of sides.
Exploring and Classifying Polygons
COURSE 1 LESSON 8-5
hexagon pentagon
b. a.
8-5
Quick Check
Determine whether each polygon is regular
or irregular.
Exploring and Classifying Polygons
COURSE 1 LESSON 8-5
a. No sides or angles are congruent. It is an
irregular polygon.
b. All sides and angles are congruent. It is a
regular polygon.
8-5
Quick Check
Exploring and Classifying Polygons
COURSE 1 LESSON 8-5
Write all the possible names for the quadrilateral.
Then give the best name.
Exactly one pair of opposite sides is parallel.
Its only possible name is a trapezoid.
8-5
Quick Check
How can you classify polygons?
By their number of sides.
What are the five special quadrilaterals that have
parallel sides?
Trapezoid, parallelogram, rectgangle, rhombus and
square.
Closure
Exploring and Classifying Polygons
Identify each polygon. Write all the possible names.
Determine if each polygon is regular or irregular.
1. 2.
3. 4.
COURSE 1 LESSON 8-5
octagon; regular hexagon; regular
quadrilateral, rhombus; irregular
parallelogram quadrilateral, trapezoid; irregular
8-5
Class work
Work
pg 389 – 390 1 - 32
Homework
pg 367 Practice 8-5
pg 368 Guided Problem Solving 8-5
Work