Question
Find the diameter of a circle whose circumference is: $12.56\ cm$
✓
Answer
Let the radius of the circle be $r\ cm.$
Circumference of the circle $(C) =12.56\text{cm}$
$\Rightarrow2\times\frac{22}{7}\times\text{r}=12.56$
$\Rightarrow\text{r}=\frac{12.56\times7}{2\times22}=1.99\text{cm}$
Now, diameter $=2\times\text{r}=2\times1.99=3.99\text{cm}$
Circumference of the circle $(C) =12.56\text{cm}$
$\Rightarrow2\times\frac{22}{7}\times\text{r}=12.56$
$\Rightarrow\text{r}=\frac{12.56\times7}{2\times22}=1.99\text{cm}$
Now, diameter $=2\times\text{r}=2\times1.99=3.99\text{cm}$
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