2.5

How Can See It?

Pg. 20

Classify Polygons

2.5 – How Can I See It?______________Classify Polygons

In this section you will discover the names of the many different polygons and how they are classified.

Polygon:

2. No sides overlap

3. No curved sides

1. Has at least 3 sides

Side: Line segment forming the polygon

M

T

SR

Q

QM

MT

TS

SR

RQ

Vertex: Point where two sides meet

M

T

SR

Q

M

T

S

R

Q

Consecutive Sides: Two sides that share a point, one after the other

M

T

SR

Q

and MTQM

and QRQM

Diagonal:Segment that joins two nonconsecutive sides M

T

SR

Q

QT

QS

MS

MR

TR

# of sides Name

3

4

5

trianglequadrilateral

pentagon

# of sides Name

6

7

8

9

10

11

12

13

n

hexagon

heptagon

octagon

nonagon

decagon

11-gon

dodecagon

n-gon

13-gon

Convex: No corners point inside the shape

Concave: Not convex! A corner points inside the shape

1. State whether the shape is a polygon. If yes, is it concave or convex? If no, why not?

Curved side

Yes, Concave or Convex

OR

No, _________________

1. State whether the shape is a polygon. If yes, is it concave or convex? If no, why not?

Yes, Concave or Convex

OR

No, _________________

1. State whether the shape is a polygon. If yes, is it concave or convex? If no, why not?

Yes, Concave or Convex

OR

No, _________________

1. State whether the shape is a polygon. If yes, is it concave or convex? If no, why not?

Yes, Concave or Convex

OR

No, ____________________Overlaps

Equilateral Equiangular Regular

All sides are congruent

All angles are congruent

All sides AND all angles are congruent

2. Classify the name of the polygon by the number of sides. Is the polygon equilateral, equiangular, regular, or neither?

Equilateral

Pentagon

a.

b.

Regular

quadrilateral

c.

Equiangular

Octagon

d.

Regular

Heptagon

e.

equilateral

decagon

f.

neither

Hexagon