Answer:
area = 832 m²
Explanation:
the area (A) is calculated as
A = pa ( p is the perimeter and a the apothem )
a decagon has 10 sides , then
p = 10 × 10.4 = 104 m
A = × 104 × 16 = 52 × 16 = 832 m²
A = 832 m²
using the formula of a regular polygon with,
n = number of sides
s = Side length
a = apothem
Area = ½ × ans
Where n = 10, a = 16 and s = 10.4
A = ½ × 16 × 10 × 10.4
A = ½ × 1664
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pa ( p is the perimeter and a the apothem ) × 104 × 16 = 52 × 16 = 832 m²