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2015-01-03T03:34:44+05:30

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Let the angle of th sector be  Ф rad.   
perimeter = 6 Ф = 20   => Ф = 10/ 3 rad

area = π 6² * (10/3) / 2π = 60 cm²
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2.
 diameter of the hemisphere = side of cube = 7 cm
 surface area = 5 * 7² +  (7² - π 3.5²) +   (4π 3.5² )/2
                    =  294 + π 3.5²  cm²

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2015-01-03T19:01:23+05:30
The answer of the first one is
A=length of the arc/2 pi r* pi r^2
=8/2.pi.6 *pi.36
= 24
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