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  1. The ratio between the area of two circles is 4 : 7. What will be the ratio of their radii?
    1. 2 : √7
    2. 4 : 7
    3. 16 : 49
    4. 4 : √7
Correct Option: A

Using Rule 14,
πr1² : π2² = 4 : 7
⇒ r1 : r2 : √4 : √7 = 2 : √7


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