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Solution
Let the radius and diameter of the circle be $$r$$ and $$D$$ respectively.
$$D=\frac{r}{2} = \frac{30.8}{2} =15.4 cm $$
Area of a circle = $$\pi r^{2}$$
$$=\frac{22\times15.4\times15.4}{7}$$
$$ =745.36 sq. cms$$
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