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Answer:
12x18
Step-by-step explanation:
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
The area of a circle is pi times radius^2
So if you use 3.14 x 16, it gives you approximately 50.264
Answer:t
Step-by-step explanation:
3x + 4 = 13
3x = 9
x = 3
Option 3