MCQ
The perimeter of a protractor is :
- A$\pi\text{r}$
- B$\pi+2\text{r}$
- C$\pi+\text{r}$
- ✓$\pi\text{r}+2\text{r}$
✓
Answer
Correct option: D.
$\pi\text{r}+2\text{r}$
Let the radius of the protractor be $r$
$\therefore$ The perimeter of protractor $=$ Perimeter of semicircle $+$ Diameter of the semicircle
$\Rightarrow $The perimeter of protractor $=\pi\text{r}+2\text{r}$
$\therefore$ The perimeter of protractor $=$ Perimeter of semicircle $+$ Diameter of the semicircle
$\Rightarrow $The perimeter of protractor $=\pi\text{r}+2\text{r}$
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