Answer:
Let the radius of the circle be r. Then, Circumference = 31.4cm or \[2\pi =31.4\] or, \[2\times 3.14\times r=31.4\] Or \[r=\frac{31.4}{2\times 3.14}=5\] \[\therefore \] Radius = 5 cm Area of the circle = \[\pi {{r}^{2}}\]= (\[3.14\times 25\]) \[c{{m}^{2}}\] = 78.5\[c{{m}^{2}}\]
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