Final answer:
The area of the rectangle, which is assumed to represent the surface of the bed, is calculated by multiplying the length (140 ft) by the width (100 ft) to get 14,000 square feet. However, none of the given multiple-choice options match this calculation.
Step-by-step explanation:
To determine how many square feet of the triangle are required to cover the surface of the bed, we need to calculate the area of the triangle. For a rectangular surface like a bed, the area is found by multiplying the length by the width. The information provided states that the dimensions of the building (which we can assume to represent the bed for this question) are 140 ft by 100 ft. This gives us:
Area = Length × Width
Area = 140 ft × 100 ft
Area = 14,000 square feet
Since none of the multiple-choice options (a. 100 feet, b. 50 feet, c. 75 feet, d. 125 feet) correspond to our calculated area of 14,000 square feet, there seems to be a discrepancy. It's possible there may be an error in the question or the answer choices provided. Nonetheless, the correct calculation of a rectangle's area is by multiplying the length by the width.