The formula for a circle is \(\pi r^2\) so the formula for a quarter circle would be \(\frac{1}{4}\pi r^2\). If \(\pi\) is 3.14, and the radius is 3 km, then your answer would be \(\frac{1}{4} \cdot 3.14 \cdot 3^2 \), or 7.065 km^2, which, rounded to the nearest hundredth, would be 7.07 km^2.
