Question

Find the area of region 1 of the composite figure:

Answer 1

A₁ = 950 mm²

Explanation:

region 1 is a trapezium with area (A₁ ) calculated as

A₁ =
`(1)/(2)` 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 =
`(1)/(2)` × 38 × (30 + 20) = 19 × 50 = 950 mm²