Answer:
 30√3 m ≈ 52 m
Step-by-step explanation:
The side ratios in a 30°-60°-90° triangle are 1 : √3 : 2. The long leg of the triangle is √3 times 30 m, or about 51.96 m.
The distance between the tree and the tower is about 30√3 m ≈ 52 m.
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If you haven't memorized the ratios of this special triangle, you can use the relation ...
 Tan = Opposite/Adjacent
 tan(30°) = 30/d
 d = 30/tan(30°) = 30√3 = 51.96 . . . . same as above
