An otter weighs 7.4 kilograms. How many grams does the otter weigh? Use the number of zeros of the product when multiplying a number by a power of 10 to help you. A 740 grams B 7,400 grams C74,000 grams D 74 grams

The cover would be a circle, and to find the area, the formula would be (pi)r^2. r stands for the radius, and a diameter(which is 7 for this problem) divided by 2 equals the radius.
the radius would be 3.5ft, because 7/2 is 3.5.
you would use the radius inside the formula:

a=(pi)r^2
a=(3.14)(3.5)^2
a=38.465

38.465 rounded would be 38.5ftsquared