How many years were there from 1556 to 1728?

If i understand your question correctly, the answer is 172 years.

All you have to do is subtract
 1728
-1556

172 

A)26•2=52there are 2 sides with the same length116-52=64the other 2 side have to be half of 64 each64/2=32the width is 32b)make two sentences about these steps because your teacher knows how you write and explain things.