The tiles in the floor of a bathroom are 15/16 inch squares. the cement between the tiles
is 1/16 inch. there are 3240 individual tiles in this floor. the area of the floor is
a. 225 sq. yds.
b. 2.5 sq. yds.
c. 250 sq. ft.
d. 22.5 sq. yds
e. 225 sq. ft.

Ok so the answer in here is the option B. 2.5 sq. yds. We get to this conclusion when we get the data and we proceed like this: 
3240 square inches of tiles 
144 square inches per square foot yields 22.5 square feet 
9 square feet per square yard yields 2.5 square yards 
I hope this is useful

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's