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

## Answer This Question

## Related Questions

- Geometry/Trigonometry - Circles with centers (2,1) and (8,9) have radii 1 and 9...
- trig - Two circles of radii 5 and 3 cm, respectively, intersect at two points. ...
- Trig - Three circles with radii of 4, 5, and 6 cm, respectively, are tangent to ...
- algebra - Rectangle R is formed by joining the centers of two congruent tangent ...
- trigonometry - three circles of radie 3,4, and 5 units respectively are tangent ...
- Math - circles P and Q are externally tangent at T. Horizontal lines l and m are...
- MATHS - two circles c1 and c2 meet at the points A and B. CD is a common tangent...
- MATH - Three circles, each with a radius of 10, are mutually tangent to each ...
- maths - Three circles, each with a radius of 10, are mutually tangent to each ...
- geometry!!!!!!!!!! - Three circles, each with a radius of 10, are mutually ...

More Related Questions