if you have already covered slopes, you could also get it that way, in fact is simpler that way.
What mathematical sentence is represented by the diagram?
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if you have already covered slopes, you could also get it that way, in fact is simpler that way.
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
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