• A four sided polygon.

• All right angles• Area: base x

height

• A four sided polygon

• All right angles• Equal sides• Area: side x

side

• A four sided polygon• Two pairs of parallel sides• Area: base x height

• Four sided polygon

• Four sides of equal lenght

• Area: (D x d) : 2

• Four sided polygon• Exactly one pair of

parallel sides, they are called bases

• Area: (B + b) x height

2

• Three sides have the same lenght

• The angles measure 60 degrees

• Two sides have the same lenght, and the other has different

• The three sides have different lenght

• It has three acute angles (less than 90 degrees)

• One of the three angles measures more than 90 degrees

•One angles is right (90 degrees)