A triangle is a type of polygon with ___ sides. How many sides does a triangle have?
Three (3)
How many sides does a polygon of this type have?
Four (4)
How many sides does a polygon of this type have?
Five (5)
How many sides does a polygon of this type have?
Six (6)
How many sides does a polygon of this type have?
Eight (8)
What do we call a polygon with three sides?
Triangle
What do we call a polygon with four sides? HINT: not all four sided polygons are squares.
Quadrilateral
How many sides does a pentagon have?
Five (5)
How many sides does a hexagon have?
Six (6)
If an octopus has eight tentacles, how many sides do you think an octagon has?
Eight (8)
This polygon has three sides so it is a triangle, these sides are all the same length so is it a regular or irregular polygon? ![]()
Regular
Is this polygon a quadrilateral? Why?
Yes. It has four sides.
This is an irregular polygon with five sides, what kind of polygon is it? HINT: a polygon with three sides is a triangle, and a polygon with four sides is a quandrilateral.
Pentagon
Is this polygon a hexagon? 
Yes! It is an irregular hexagon. It has six sides with different lengths.
Is this hexagon regular or irregular? ![]()
Regular! It is an octagon with eight sides of equal length.
Can a triangle ever have parallel lines?
No.
Can an irregular quadrilateral have parallel lines?
Yes! Rectangles are irregular polygons with two sets of parallel lines!
A pentagon has five sides. Can a regular pentagon have parallel lines?
NO! A regular shape with an odd number of sides can never have parallel lines.
How many parallel lines does a regular hexagon have?
Six (6). A regular hexagon has six sides that are all even in length. Because it has an even number of sides each line is parallel with the line on the opposite side!
Does a regular octagon have perpendicular lines?
Yes. But they do not meet at right angles.
Is it possible to make a triangle with perpendicular lines? If so would it be a regular or irregular polygon?
Yes, but it can only be irregular.
What is the common name for a regular quadrilateral?
Square
Draw an irregular pentagon on the whiteboard.
If the shape has five sides of different lengths then it is an irregular pentagon.
Draw a hexagon. Is it regular or irregular? How can you tell?
A hexagon has six sides. It is regular if all the sides are even (your drawing does not have to be perfect). It is irregular if the sides have different lengths.
Draw a octagon with a perpendicular line.
A octagon has eight sides. Perpendicular lines do not HAVE to meet at a right angle but if extended they will.