Discussion
On a constraint diagram, the feasible design region is
Answer: B
Correct answer: The area satisfying every constraint simultaneously
The feasible region is the set of wing loading and thrust-to-weight combinations that satisfy every requirement at once. Each constraint divides the plane into an acceptable and an unacceptable side, and the feasible region is the intersection of all the acceptable sides.
It is not simply the area below all the lines, because some constraints - the landing line, for instance - bound the plane from the right rather than from above. Nor is it a single point: it is generally a region, and choosing within it is the designer's decision. If the intersection is empty, no design meets the requirements as stated.
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