Circle Geometry

Sep 2009
4
0
Could someone please help me with this circle geometry questions? I just confused just not exactly sure how to do any of these kinds of questions. Any help is apperciated.Thanks in advance
 

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Jun 2009
806
275
Could someone please help me with this circle geometry questions? I just confused just not exactly sure how to do any of these kinds of questions. Any help is apperciated.Thanks in advance
Since AOB is an equilateral triangle, angle AOB = π/3 rad.
Perimeter of the shaded portion is AB + 1/6(2πR) , where R is the radius circle i.e. OA
Area of the shaded portion is 1/6(πR^2) - area of OAB.