Answer:
A = 30 yd²
Explanation:
the figure is a trapezium whose area (A) is calculated as
A = h (b₁ + b₂)
where h is the perpendicular height between bases b₁ and b₂
here h = 5 , b₁ = 8 , b₂ = 4 , then
A = × 5 × (8 + 4) = 2.5 × 12 = 30 yd²
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h (b₁ + b₂) × 5 × (8 + 4) = 2.5 × 12 = 30 yd²