Find the area of a circle whose radius is 14 inches. (use π = 3.1416.)
a. 87.9648 square inches
b. 43.9824 square inches
c. 615.7536 square inches
d. 153.9384 square inches

  C. 615.7536 square inches

Step-by-step explanation:

The formula for the area of a circle is ...

  A = πr²

Fill in the given numbers and do the arithmetic.

  A = 3.1416×(14 in)² = 615.7536 in²

Comment on the value of pi

We are interested to see that recent problems require use of a value of pi that has 5 significant digits, instead of 3 (as in 3.14). The only problem in this scenario is that the answer is now reported to 7 significant figures, so is still wrong. The correct 7-digit answer to this problem is 615.7522 in². It would be obtained by using a 7- or 8-digit value for pi: 3.141593 or 3.1415927 and rounding appropriately.

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

answer: what do you mean