The area of the incircle of an equilateral triangle of side 42 cm is (Take $\pi$ = $\frac{22}{7}$)

The area of the incircle of an equilateral triangle of side 42 cm is (Take $\pi$ = $\frac{22}{7}$)
1). 231 sq.cm.
2). 462 sq.cm.
3). $22\sqrt{3}$ sq.cm.
4). 924 sq.cm.

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