Question
Find the diameter of a circle whose circumference is:
$11.0\ km.$
$11.0\ km.$
✓
Answer
Let the radius of the circle be $r\ km.$
Circumference of the circle $(C) =11.0\text{km}$
$\Rightarrow2\times\frac{22}{7}\times\text{r}=11$
$\Rightarrow\text{r}=\frac{11\times7}{2\times22}=1.75\text{km}$
Now, diameter $=2\times\text{r}=2\times1.75=3.5\text{km}$
Circumference of the circle $(C) =11.0\text{km}$
$\Rightarrow2\times\frac{22}{7}\times\text{r}=11$
$\Rightarrow\text{r}=\frac{11\times7}{2\times22}=1.75\text{km}$
Now, diameter $=2\times\text{r}=2\times1.75=3.5\text{km}$
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