If A is the area and C the circumference of a circle, which of the following is an expression for A in terms of C?

1. If A is the area and C the circumference of a circle, which of the following is an expression for A in terms of C?

[BKB Senior Officer-2012 : 2012]

1. c²/4π

2. c²/4π²

3. 2c

4. 2c²√π

Answer

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