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What dimensions can créate more than one triangle ?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq