2. What is the approximate area, in square feet, of a circle with d a. 15.7 b. 31,4 c. 78.5 d. 314

## Step 1: Calculate the radius<br />### The diameter of the circle is given as 10 feet. The radius is half the diameter: $r = \frac{d}{2} = \frac{10}{2} = 5$ feet.<br /><br />## Step 2: Calculate the area<br />### The area of a circle is given by the formula $A = \pi r^2$. Substituting $r=5$, we get $A = \pi (5^2) = 25\pi$. Using the approximation $\pi \approx 3.14$, the area is $A \approx 25 \times 3.14 = 78.5$ square feet.