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  1. The ratio of circumference and diameter of a circle is 22 : 7. If the circumference be
    1
    1
    		 m
    7
    then the radius of the circle is :
    1. 1
      		 m
      3
    2. 1
      		 m
      2
    3. 1
      		 m
      4
    4. 1 m
Correct Option: C

Using Rule 14,

Circumference
 =
22
Diameter7

⇒
11
7 =
22
2r7

⇒
11
 =
22
14r7

⇒ 14r × 22 = 11 × 7
⇒ r =
11 × 7
 =
1
 metre
14 × 224


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