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  1. The area of a circle is 324π square cm. The length of its longest chord (in cm.) is
    1. 36
    2. 28
    3. 38
    4. 32
Correct Option: A

Using Rule 14,
Area of circle = πr²
⇒ πr² = 324π
⇒ r² = 324
∴ r = √324 = 18 cm.
∴ Length of longest chord of circle = Diameter = 2 × 18 = 36 cm.



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