In the circle above, centered on point O, angle AOB measures 40 degrees. If line segment BD measures 18 inches, what is the measure, in inches, of minor arc BC?

A pizzeria measures its pizzas by their diameters when listing sizes on the menu. What is the difference, in square inches, in surface area between a 10-inch pizza and an 8-inch pizza from that pizzeria (assume that each pizza has a negligible height/thickness)?

On a certain circular dartboard, the diameter of the circular bullseye is 4 inches and the diameter of the entire board is 20 inches. If a dart hits the board in a random location, what is the probability that it hits the bullseye target?

If the circle above has center A and area , what is the perimeter of sector ABCD?

A bicycle tire has a diameter of 70 centimeters. Approximately how many revolutions does the tire make if the bicycle travels 1 kilometer? (1 kilometer = 1000 meters = 100000 centimeters)

What is the area of a circle with a circumference of ?

A gas pipe has an outside diameter of 24 inches. The steel wall of the pipe is 1 inch thick. What is the area of the cross-section of the steel wall of the pipe?

The area of the semicircle above is . What is the length of the arc connecting points A and B?

A circle has an area of . What is its circumference?

In the figure above, AC is the diameter of a circle with center O. If the area of the circle is , what is the length of minor arc BC?