arthuro69 wrote:

What is the perimeter of an equilateral triangle inscribed in a circle of radius 4 ?

A. 6\sqrt{2}

B. 6\sqrt{3}

C. 12\sqrt{2}

D. 12\sqrt{3}

E. 24

source: readyforgmat.com

Hi, there. I'm happy to help.

The full solution to the problem is in the attached pdf.

If the details of the 30-60-90 triangle are not familiar to you, I recommend brushing up with this post:

http://magoosh.com/gmat/2012/the-gmats- ... triangles/Let me know if there are any further questions.

Mike

_________________

Mike McGarry

Magoosh Test Prep