Answer:
A = 18 cm²
Explanation:
the area (A) of a trapezoid is calculated as
A = h (b₁ + b₂ )
where h is the perpendicular height between the bases b₁ and b₂
here h = 3 , b₁ = 8 , b₂ = 4 , then
A = × 3 × (8 + 4) = 1.5 × 12 = 18 cm²
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h (b₁ + b₂ ) × 3 × (8 + 4) = 1.5 × 12 = 18 cm²