F(x)= 20 + 12(x - 2)
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<h2><u>Solution</u><u> </u><u>:</u><u>-</u></h2>The given shape is known as Trapezium or Trapezoid.
Area of trapezium = ½(Sum of parallel dides) × Height
Area = ½ (3 + 6) × 4
Area = (3 + 6) × 2
Area = 9 × 2
Area = 18 m²