Question

a circular Park of radius 30 m has a track of width 2.5 M on its inner side find the area of the track. (pie 3.
14).

Answer 1

$area \: of \: track \: is \: \pi \: r1 { }^{2} - \pi \: r2 {?}^{2} \\ here \: r1 \: is \: 30cm \: and \: r2 \: is \: (30 - 2.5) = 27.5cm \\ area \: = \: 3.14 \times 30 {}^{2} - 3.14 \times 27.5 {}^{2} \\ 3.14(900 - 756.25) \\ 3.14 \times 143.75 \\ \\ 451.75cm {}^{2}$