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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

The values are approximately 14 for first one

for second 75

for second 75