Question 1205194
Find the radius, in cm, of the large circle if the radius of the smaller circle
is 5 sqrt3 cm. The angle formed by the two radii at the center is 60 degrees.
<pre>
I think this is the correct figure.  

Angle AOB has measure {{{60^o}}} and OB = {{{5sqrt(3)}}}

Find OA.

Now you other tutors take it from there.

{{{drawing(400,400,-19,19,-19,19,circle(0,0,5sqrt(3)),circle(0,0,10sqrt(3)),
line(0,0,5sqrt(3),15),
line(0,0,5sqrt(3),0),line(5sqrt(3),0,5sqrt(3),15),


locate(-.8,.7,O), locate(9,.7,B),locate(9,15.7,A)

 )}}}

Edwin</pre>