Posted by Tyler on Sunday, December 5, 2010 at 10:49pm.
Four circles with centers A,B,C,and D are mutually tangent. The areas of circles A,B,C, and D are 25pi, 100pi, 16pi, and 225pi respectively. How many units are in the perimeter of quadrilateral ABCD?

Algebra  drwls, Monday, December 6, 2010 at 3:19am
The radii of the circles are 5, 10, 4 and 15.
If they can be arranged to be mutually tangent, the quadrilateral ABCD connects the centers of the circles, and has perimeter = 2(4 + 5 + 10 + 15) = 68

Algebra  grre, Tuesday, December 14, 2010 at 4:32pm
rgr
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