A) 29.2cm.
B) 28.9 cm.
C) 30.8cm.
D) 40.2 cm.
Correct Answer: C
Solution :
\[\frac{22}{7}\,\,{{r}^{2}}=75.46\] \[\Rightarrow \] \[{{r}^{2}}=\frac{75.46\,\,\,\,\,7}{22}=\,\,24.01\] \[\Rightarrow \] \[r=\sqrt{24.01\,}\,\,\,=4.9\]cm. \[\therefore \] Circumference of the circle \[=2\pi r=\,\,2\,\,\frac{22}{7}\,\,\,4.9=30.8\] cm.
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