To name each figure below, use as many of the letters A, B, C,...as you need, in order, starting with A. For each figure, how many letters do you need? With this labeling, how many different ways can you name the figure?

Question

To name each figure below, use as many of the letters A, B, C,...as you need, in order, starting with A.  For each figure, how many letters do you need?  With this labeling, how many different ways can you name the figure?

a. a triangle  b. a quadrilateral  c. a pentagon