Sample Response: Substitute the known circumference into the formula C = πd. Divide by π to find the diameter. Then divide the diameter in half to find the radius. Substitute the radius into the area formula, A = πr2. Square the radius and multiply by π to get the area.
So there are 64 books (lol, minecraft) 64 divided by 5= 12 remainder 4 So there are 12 complete stacks of 5.
Defend:
There are 64 books and each stack has 5 books. 64 divided by 5 equals 12 with a remainder of 4. Since each stack must have 5 books there are 12 complete stacks.