The area of Circle B is four times that of Circle A. The area of Circle C is four times that of Circle B. Which is the greater quantity?

(a) Twice the radius of Circle B

(b) The sum of the radius of Circle A and the radius of Circle C

The area of a circle is . Give its radius in terms of .

(Assume is positive.)

If the diameter of a circle is equal to , then what is the value of the radius?

Compare the two quantities:

Quantity A: The radius of a circle with area of

Quantity B: The radius of a circle with circumference of

The areas of five circles form an arithmetic sequence. The smallest circle has radius 4; the second smallest circle has radius 8. Give the radius of the largest circle.

Compare the two quantities:

Quantity A: The radius of a circle with area of

Quantity B: The radius of a circle with circumference of

The tip of the minute hand of a giant clock has traveled feet since noon. It is now 2:30 PM. Which is the greater quantity?

(A) The length of the minute hand

(B) Three yards

The time is now 1:45 PM. Since noon, the tip of the minute hand of a large clock has moved feet. How long is the minute hand of the clock?