Philip pays $1,620 in rent every month. This amount is $120 more than twice what his brother Paul pays for rent. How much does P
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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