Folding the (almost regular) Pentagon

 

 

 

Start with an “A” rectangle.

 

Fold up corner to opposite corner.

 

Crease flat

 

 

         

Fold the irregular pentagon in half

 

Crease and open

 

 

 

 

Now fold in each of the sides so they lie on the crease line

 

 

 

 

 

 

 

	The pentagon you have made is almost regular. Check to see if the sides and angles are equal by folding. You will find that they are very close to being equal. The Pentagon you have made is perfectly good enough for several maths activities including finding if pentagons tessellate. Reference  Gibbs,William PRIME Vol 4 1982