Posted by kourtney on Tuesday, May 10, 2011 at 12:38am.
A belt wrapped tightly around cicle O forms a 60 degree angle at P, a point outside the circle. Find the length of the belt if cicle O has a radius of 9.

honors geometry  Smith, Tuesday, May 10, 2011 at 12:58am
That's kind of hard to imagine, but it seems to me you just plug 9 in into the formula... Please clarify if I'm wrong.

honors geometry  kourtney, Tuesday, May 10, 2011 at 1:03am
A belt wrapped tightly around cicle O forms a 60 degree angle at P, a point outside the cicle. Find the length of the belt if the cicle O has a radius of 9.
diagram looks like a cicle with two tangent lines joining at point P outside the cicle. looks like a ice cream cone.
need help

honors geometry  drwls, Tuesday, May 10, 2011 at 1:20am
Lines from the points of contact of a tangent to the center of the circle are at right angles to the tangent.
Draw triangles connecting a tangent point, P and the center of the circle. This will form two 306090 right triangles.
The angle subtended by the belt from the center of the circle is 120 degrees.
The length of the belt is (2/3)*pi*R
= 18.85
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