A triangle ABC rotates about the side [BC] and $\angle$ ABC = 120°

Find the area of of the surface which results from the rotation of the polygonal line formed by the sides [CA] and [AB] of |AB| = 2 $\sqrt{3}$ and |BC| = 5,

The answer is 54.11.

**
This section requires Javascript.
**

You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.

No explanations have been posted yet. Check back later!