3. A sheep contains fourteen square feet. One-tenth of a square inch contains ten thousand hairs. How many will the fourteen square feet contain?

Step 1 ：Convert 14 square feet to square inches: \(14 \times 144 = 2016\) square inches

Step 2 ：Calculate the total number of hairs: \(2016 \times 10000 = 20160000\) hairs

Step 3 ：\(\boxed{20160000}\) hairs in the fourteen square feet of the sheep