The angle does not matter. Think of it as finding the other side to a triangle. Use
a=39 (line AB)
b=b (the leg we need to find)
c=89 (line BD)
(subtract the 1521 from both sides)
(square root both sides)
b = 80
AD=80
Step-by-step explanation:
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The correct answer would be B
Why this would be correct is that time fever dtipsbit is always going so that consists of the elevator still moving