Answer:
A₁ = 950 mm²
Step-by-step explanation:
region 1 is a trapezium with area (A₁ ) calculated as
A₁ = [tex]\frac{1}{2}[/tex] h (b₁ + b₂)
where h is the perpendicular height between bases and b₁, b₂ the bases
here h = 38 , b₁ = 30 and b₂ = 20 , then
A₁ = [tex]\frac{1}{2}[/tex] × 38 × (30 + 20) = 19 × 50 = 950 mm²
