Unit 4 Quadrilaterals and Polygons

A polygon is a closed figure made by

joining line segments, where each line

segment intersects exactly two others.

These are examples

of polygons.

This, however, is not a polygon.

Why

not?

It isn’t a polygon because it isn’t a

closed figure.

Now it’s a

polygon!

This is not a polygon.

Why

not?

This figure isn’t a polygon

because it is not made of line

segments.This is a

line

segment.

This figure isn’t a polygon.

This figure isn’t a polygon

because its sides do not intersect

in exactly two places each.

This line

intersects

with other

lines in 3

places.

Hold up your left hand if you see a

polygon.

Hold up your right hand if you see

something that isn’t a polygon.

Let’s do page # 46 in your math books.

Look at the picture and write YES if you

see a polygon or NO if you don’t.