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$$2\pi r = 26.4$$
$$2\times \frac{22}{7}\times r=26.4$$
$$r = 4.2$$
area = $$\pi r^{2}$$ = $$\frac{22}{7}(4.2)^{2}$$ = $$55.44 cm^{2}$$
So the answer is option A.
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