Question

The radius of a quarter of a circle measures 3.5 cm. What is the perimeter of the quarter of the circle, correct to one decimal place.

Answer 1

Radius of quarter of circle will be the radius of the circle.
So, radius of the circle = 3.5 cm
So, the perimeter of circle = circumference of the circle = $2\mathrm{\pi r}=2\times \frac{22}{7}\times 3.5$ = 22 cm
Perimeter of quarter of circle will be one-fourth of Perimeter of circle.
So, perimeter of quarter of circle = $\frac{1}{4}\times 22$ = 5.5 cm