Explanation:
1 cm = 12 ft
so, we know the scaling factor.
if 1 cm = 12 ft, then how many ft are 8 1/3 cm ?
yes, that's what the line above the 3 means : the number is actually
8.333333333333... = 8 1/3
and this is
8 1/3 × 12 = 8×12 + 1/3 × 12 = 96 + 12/3 = 96 + 4 = 100 ft
and 18.75 cm = 18 3/4 cm
and that is
18 3/4 × 12 = 18×12 + 3/4 × 12 = 216 + 3×12/4 =
= 216 + 9 = 225 ft
so, the actual fenced area will be
225 ft long
100 ft wide
the perimeter of the fence is therefore
2×225 + 2×100 = 450 + 200 = 650 ft