Question

Radius of a circular garden is $9$ m. A circular path of width of $3.5$ m is laid around and outside the garden. Find its area.

Answer 1

Area of path $=\pi (R^2-r^2)$

$=\pi ({\left(\frac{25}{2}\right)}^2-{\left(9\right)}^2)m^2$

$=\pi (\frac{625}{4}-81)m^2$

$=\pi \left(\frac{625-324}{4}\right)m^2$

$=\pi \left(\frac{301}{4}\right)m^2$