RRB Junior Engineer Stage 1 Model Papers 3

Question : 28 of 100

Marks: +1, -0

The perimeter of a semi-circular area is 18 cm, then the radius is : (using

π=22/7

)

Solution:

Perimeter of a semicircular area = 18 cm
perimeter of semicircular = 18 cm

⇒{2πr}/2+2r=18

⇒r(π+2)=18

r=18/{22/7+2}={18×7}/{22+4}=3 1/2cm

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