a) Two semicircular parts are removed from a semicircular disc, as shown in Fig 7.
(i) Find area of the shaded region.
(ii) If a thread is to be placed around the boundary of the shaded region, find the
length of the thread required.
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area of shaded region=area of semi circle-(sum of area of two non shaded sem circles)
=(πR^2/2)-(πr^2/2+π(R/2)^2/2)
=800π-(50π+200π)
=550π m^2
length of thread=πR
=20π
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