DAT math problem

[jefnawe]

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EACH OF THE CIRCLES A,B,C IS TANGENT TO THE OTHER TWO CIRCLES. THE AREAS OF THE CIRCLES ARE 4 PI, 9 PI, 16 PI. WHICH REPRESENTS THE LENGTH OF THE PERIMETER OF THE TRIANGLE FORMED BY JOINING THE CENTERS OF THREE CIRCLES?
A)3.0
B)9.0
C) 14.5
D) 18.0
E) 29.0

ANYBODY KNOWS HOW TO WORK THIS PROBLEM?

 

[DAT Destroyer]

First find the radius of each circle. A = pi*r^2. for the first circle the radius is 2, the second circle the radius is 3 and the third circle the radius is 4.the perimeter of the triangle is therefore: 2*2 +2*3+2*4 = 18 which is choice D

Hope this helps..

 

[jefnawe]

thank you very much I knew it would be a simple question, but I had no clue what the first step would be.

 

[DAT Destroyer]

thank you very much I knew it would be a simple question, but I had no clue what the first step would be.

Glad I could clear things up ..

Good luck in your studies and on the DAT

Nancy