1. A circle has a diameter of $25$ yards. Find its area, using $3.14$ for $\pi$. Round your answer to the nearest hundredth. The area is ___ square yards.
2. A circle has a radius of $5.2$ feet. What is its area? Use $3.14$ for $\pi$ and round to the nearest hundredth. The area is ___ square feet.
3. How much canvas material, in square feet, is needed to cover a circular wading pool with a diameter of 14 feet? Round your answer to two decimal places. The area is ___ square feet.
4. To justify the formula for the area of a circle, the circle is often cut into wedges and rearranged to approximate what geometric shape?
5. A rotating lawn sprinkler waters a circular area. The edge of the watered circle is 8 feet from the sprinkler. What is the area of the lawn watered by the sprinkler? Use $\pi \approx 3.14$.
6. A circular garden has a radius of 8 meters. The diameter of the garden is ___ meters.
7. The diameter of a round dinner plate is 20 cm. What is the length of its radius?