The area of a rectangular plot is 462 m2 and its length is 28 m.

Area of the rectangular plot = 462 m2
Length (l) = 28 m

Area of a rectangle $=$ Length $(l) \times$ Breadth $(b)$

$\Rightarrow 462=28 \times b$

$\Rightarrow b=16.5 \mathrm{~m}$

Perimeter of the plot $=2(l+b)$

$=2(28+16.5)$

$=2 \times 44.5$

$=89 \mathrm{~m}$