Answer:
A = 16.5 cm²
Explanation:
the area (A) of a trapezoid is calculated as
A = h (b₁ + b₂ )
where h is the perpendicular height between bases and b₁, b₂ the bases
here h = 3, b₁ = 7 , b₂ = 4 , then
A = × 3 × (7 + 4) = 1.5 × 11 = 16.5 cm²
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h (b₁ + b₂ ) × 3 × (7 + 4) = 1.5 × 11 = 16.5 cm²