AMC 10 Step by Step
Log inSign up
Printable

2007 AMC 10B Problem 18

Include the solutionBack to the problem
2007 AMC 10B Problem 18AMC 10 Step by Step
Name:                             Date: September 13, 2026
Circles · difficulty 3 of 5 · about 4 min · position P16-20

A circle of radius 11 is surrounded by 44 circles of radius rr as shown. What is rr ?
figure

  1. A)

    2\sqrt{2}

  2. B)

    1+21+\sqrt{2}

  3. C)

    6\sqrt{6}

  4. D)

    33

  5. E)

    2+22+\sqrt{2}

Working