Three circles are externally tangent to one another. The radius of each of the circles is 2 cm. A belt fits tightly around the three circles. Find the length of the belt. Express your answer in terms of pi with an explanation.

asked by Brittany
  1. πd is the circumference of a circle, so with a diameter of 4 a single circle has a circumference of 4π. 1/3 of each circle is in contact with the belt, so that total part is still 4π. Then, the part of the belt connecting from tangent to tangent is 2 radii, so 3 areas is 12. The belt would then be 12+4π cm.

    posted by Brittany

  2. Click the correct answer.
    Which is greater, the circumference of a circle with radius 3 ft, or the distance around a semicircle with diameter 16 ft? By how much?
    A. circle, by 4 ft
    B. circle, by 2 ft
    C. semicircle, by 4 ft
    D. semicircle, by 2 ft

    posted by Anonymous
  3. d

    posted by Anonymous

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