# Challenge Exercises: Circumference and Area

Directions: Read each question below. Click once in an ANSWER BOX and type in your answer; then click ENTER. After you click ENTER, a message will appear in the RESULTS BOX to indicate whether your answer is correct or incorrect. To start over, click CLEAR. Use  = 3.14 to calculate your answers.

 1 A dinner plate has a radius of 6 centimeters. What is the area? ANSWER BOX:  cm2   RESULTS BOX:
 2 The distance around the wheel of a truck is 9.42 feet. What is the diameter of the wheel? ANSWER BOX:  ft   RESULTS BOX:
 3 A lawn sprinkler sprays water 5 feet in every direction as it rotates. What is the area of the sprinkled lawn? ANSWER BOX:  ft2   RESULTS BOX:
 4 What is the circumference of a 12-inch pizza? ANSWER BOX:  in   RESULTS BOX:
 5 A dog is tied to a wooden stake in a backyard. His leash is 3 meters long and he runs around in circles pulling the leash as far as it can go. How much area does the dog have to run around in? ANSWER BOX:  m2   RESULTS BOX:
 6 The distance around a carousel is 21.98 yards. What is the radius? ANSWER BOX:  yd   RESULTS BOX:
 7 A storm is expected to hit 7 miles in every direction from a small town. What is the area that the storm will affect? ANSWER BOX:  mi2   RESULTS BOX:
 8 An asteroid hit the earth and created a huge round crater. Scientists measured the distance around the crater as 78.5 miles. What is the diameter of the crater? ANSWER BOX:  mi   RESULTS BOX:
 9 A semi-circle shaped rug has a diameter of 2 feet. What is the area of the rug?  ANSWER BOX:  ft2   RESULTS BOX:
 10 A spinner has 6 sectors, half of which are red and half of which are black. If the radius of the spinner is 3 inches, what is the area of the red sectors? ANSWER BOX:  in2   RESULTS BOX: