Answers

2014-12-16T19:16:49+05:30
1. The arc is 3/4 of the circumference and is joint by radius=2.1cm
   dimension of arc=(3/4)*2π*2.1=3*4.2*π/4=3.15π=9.896cm
   The perimeter=9.896+2r=9.896+4.2=14.096

2.  The perimeter= 2πr/4+2r=42π/4+42
                                        =131.94/4+42
                                        =74.986 cm
  
2 3 2
THE FIRST ANSWER SHOULD BE 14.1 AND SECOND SHOULD BE 75
We will get the value only when we round off to second digit after decimal.
i will say the process if my ans are correct
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2014-12-16T21:04:04+05:30
The values are approximately 14 for first one
for second 75

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