Final answer:
The area of the special trapezoid is calculated by using the trapezoid area formula, which results in the correct answer, 108 square units.
Step-by-step explanation:
The student asked for the area of a special trapezoid where the lengths of the parallel sides, AB and CD, are equal to 12 units each, and the height is 9 units.
To find the area of a trapezoid, you can use the formula:
Area
= ½ × (sum of the lengths of the parallel sides) ×
height
In this case, we can plug in the given values:
Area = ½ × (AB + CD) × height
= ½ × (12 + 12) × 9
= ½ × 24 × 9
= 12 × 9
= 108 units²
Therefore, the correct answer is (d) 108 units².