The diameter of a certain circle is tripled. Compared to the circumference of the original circle, how many times as large is the circumference of the new circle?

In the game of Sumo, both wrestlers are placed on the outer edge of the ring, on opposite sides of each other. If the wrestling ring is a perfect circle and has an area of , what would be the distance between both wrestlers?

What is the circumference to diameter ratio of a circle with a diameter of 15?

Let represent the area of a circle and represent its circumference. Which of the following equations expresses in terms of ?

A can of soup has a base area of . What is the ratio of the can's diameter to its circumference?

The circumference of the base of a silo is ft. What is the ratio of the silo's circumference to its diameter?

Find the ratio of the diameter to the circumference in a circle with radius r.

True or false: A circle with radius 1 has circumference less than 4.