Question

a part 1 m wide is built along the border and inside a Square Garden of side 30 m find the area of the path

Answer 1

first of all we have to take area of big square and then subtract it to area of small square
$30 m\times 30m - 29 m\times 29m \\ = 900m ^{2} - 841 m ^{2} \\ = 59 {m}^{2}$